diff --git a/core/lib/Thelia/Controller/Admin/LangController.php b/core/lib/Thelia/Controller/Admin/LangController.php
index 6e5eb842f..543f09047 100644
--- a/core/lib/Thelia/Controller/Admin/LangController.php
+++ b/core/lib/Thelia/Controller/Admin/LangController.php
@@ -123,7 +123,6 @@ class LangController extends BaseAdminController
             $error_msg = $this->getTranslator()->trans("Failed to update language definition: %ex", array("%ex" => $ex->getMessage()));
             Tlog::getInstance()->addError("Failed to update language definition", $ex->getMessage());
         }
-echo "err=".$error_msg;
 
         return $this->renderDefault(array('error_message' => $error_msg));
     }
@@ -231,7 +230,7 @@ echo "err=".$error_msg;
         }
 
         return $this->renderDefault(array(
-           'error_delete_message' => $error_msg
+           'error_message' => $error_msg
         ));
 
     }
diff --git a/core/lib/Thelia/Form/Lang/LangCreateForm.php b/core/lib/Thelia/Form/Lang/LangCreateForm.php
index ccad58320..d41c45641 100644
--- a/core/lib/Thelia/Form/Lang/LangCreateForm.php
+++ b/core/lib/Thelia/Form/Lang/LangCreateForm.php
@@ -70,7 +70,7 @@ class LangCreateForm extends BaseForm
                 'constraints' => array(
                     new NotBlank()
                 ),
-                'label' => Translator::getInstance()->trans('ISO 639 Code'),
+                'label' => Translator::getInstance()->trans('ISO 639-1 Code'),
                 'label_attr' => array(
                     'for' => 'code_lang'
                 )
diff --git a/core/lib/Thelia/Model/ConfigQuery.php b/core/lib/Thelia/Model/ConfigQuery.php
index e34ae5e16..d0c629e99 100644
--- a/core/lib/Thelia/Model/ConfigQuery.php
+++ b/core/lib/Thelia/Model/ConfigQuery.php
@@ -92,6 +92,9 @@ class ConfigQuery extends BaseConfigQuery {
         return self::read('check-available-stock', 1) != 0;
     }
 
+    public static function getUnknownFlagPath() {
+        return self::read('unknown-flag-path', '/assets/img/flags/unknown.png');
+    }
     /* smtp config */
     public static function isSmtpEnable()
     {
diff --git a/core/lib/Thelia/Model/Lang.php b/core/lib/Thelia/Model/Lang.php
index 5f7289792..e7b83ead4 100644
--- a/core/lib/Thelia/Model/Lang.php
+++ b/core/lib/Thelia/Model/Lang.php
@@ -5,8 +5,11 @@ namespace Thelia\Model;
 use Propel\Runtime\Connection\ConnectionInterface;
 use Propel\Runtime\Exception\PropelException;
 use Propel\Runtime\Propel;
+use Symfony\Component\Filesystem\Filesystem;
 use Thelia\Core\Event\Lang\LangEvent;
 use Thelia\Core\Event\TheliaEvents;
+use Thelia\Core\Template\TemplateHelper;
+use Thelia\Core\Translation\Translator;
 use Thelia\Model\Base\Lang as BaseLang;
 use Thelia\Model\LangQuery;
 use Thelia\Model\Map\LangTableMap;
@@ -53,6 +56,33 @@ class Lang extends BaseLang {
 
     }
 
+    protected function fixMissingFlag() {
+        // Be sure that a lang have a flag, otherwise copy the
+        // "unknown" flag
+        $adminTemplate = TemplateHelper::getInstance()->getActiveAdminTemplate();
+        $unknownFlag = ConfigQuery::getUnknownFlagPath();
+
+        $unknownFlagPath = $adminTemplate->getAbsolutePath().DS.$unknownFlag;
+
+        if (! file_exists($unknownFlagPath)) {
+            throw new \RuntimeException(
+                Translator::getInstance()->trans(
+                    "The image which replaces an undefined country flag (%file) was not found. Please check unknown-flag-path configuration variable, and check that the image exists.",
+                    array("%file" => $unknownFlag)
+                )
+            );
+        }
+
+        // Check if the country flag exists
+        $countryFlag = rtrim(dirname($unknownFlagPath), DS).DS.$this->getCode().'.png';
+
+        if (! file_exists($countryFlag)) {
+            $fs = new Filesystem();
+
+            $fs->copy($unknownFlagPath, $countryFlag);
+        }
+    }
+
     public function preInsert(ConnectionInterface $con = null)
     {
         $this->dispatchEvent(TheliaEvents::BEFORE_CREATELANG, new LangEvent($this));
@@ -63,6 +93,8 @@ class Lang extends BaseLang {
     public function postInsert(ConnectionInterface $con = null)
     {
         $this->dispatchEvent(TheliaEvents::AFTER_CREATELANG, new LangEvent($this));
+
+        $this->fixMissingFlag();
     }
 
     public function preUpdate(ConnectionInterface $con = null)
@@ -75,6 +107,8 @@ class Lang extends BaseLang {
     public function postUpdate(ConnectionInterface $con = null)
     {
         $this->dispatchEvent(TheliaEvents::AFTER_UPDATELANG, new LangEvent($this));
+
+        $this->fixMissingFlag();
     }
 
     public function preDelete(ConnectionInterface $con = null)
diff --git a/install/insert.sql b/install/insert.sql
index 61b3e9045..28f9843ed 100644
--- a/install/insert.sql
+++ b/install/insert.sql
@@ -32,6 +32,8 @@ INSERT INTO `config` (`name`, `value`, `secured`, `hidden`, `created_at`, `updat
 ('url_site','', 0, 0, NOW(), NOW()),
 ('pdf_invoice_file', 'invoice', 0, 0, NOW(), NOW()),
 ('pdf_delivery_file', 'delivery', 0, 0, NOW(), NOW()),
+('unknown-flag-path','assets/img/flags/unknown.png', 0, 0, NOW(), NOW()),
+
 ('session_config.default', '1', 1, 1, NOW(), NOW()),
 ('default_lang_without_translation', '1', 1, 1, NOW(), NOW()),
 ('store_name','', 0, 1, NOW(), NOW()),
@@ -43,6 +45,7 @@ INSERT INTO `config` (`name`, `value`, `secured`, `hidden`, `created_at`, `updat
 ('thelia_release_version','0', 1, 1, NOW(), NOW()),
 ('thelia_extra_version','beta3', 1, 1, NOW(), NOW());
 
+
 INSERT INTO `config_i18n` (`id`, `locale`, `title`, `description`, `chapo`, `postscriptum`) VALUES
 (1, 'en_US', 'Class name of the session handler', NULL, NULL, NULL),
 (2, 'en_US', 'Check available product stock (1) or ignore it (0) when displaying and changing ordered quantity', NULL, NULL, NULL),
@@ -70,7 +73,8 @@ INSERT INTO `config_i18n` (`id`, `locale`, `title`, `description`, `chapo`, `pos
 (24, 'en_US', '"Remember me" cookie expiration time, in seconds, for customer users', NULL, NULL, NULL),
 (25, 'en_US', 'Base URL of the shop (e.g. http://www.yourshopdomain.com)', NULL, NULL, NULL),
 (26, 'en_US', 'Name of the invoice view in the current PDF template (without extension)', NULL, NULL, NULL),
-(27, 'en_US', 'Name of the delivery view in the current PDF template (without extension)', NULL, NULL, NULL);
+(27, 'en_US', 'Name of the delivery view in the current PDF template (without extension)', NULL, NULL, NULL),
+(28, 'en_US', 'The path (relative to the default back-office template) to the image used when no flag image can be found for a country', NULL, NULL, NULL);
 
 INSERT INTO `module` (`id`, `code`, `type`, `activate`, `position`, `full_namespace`, `created_at`, `updated_at`) VALUES
 (1, 'TheliaDebugBar', 1, 1, 1, 'TheliaDebugBar\\TheliaDebugBar', NOW(), NOW()),
diff --git a/install/thelia.sql b/install/thelia.sql
index 1ea2c4aeb..3ef2e89c2 100644
--- a/install/thelia.sql
+++ b/install/thelia.sql
@@ -1,3 +1,4 @@
+
 # This is a fix for InnoDB in MySQL >= 4.1.x
 # It "suspends judgement" for fkey relationships until are tables are set.
 SET FOREIGN_KEY_CHECKS = 0;
diff --git a/install/update/2.0.0-beta4.sql b/install/update/2.0.0-beta4.sql
index aaa6ba57b..d54df3d55 100644
--- a/install/update/2.0.0-beta4.sql
+++ b/install/update/2.0.0-beta4.sql
@@ -12,6 +12,12 @@ INSERT INTO  `module_i18n` (`id`, `locale`, `title`, `description`, `chapo`, `po
 UPDATE `config` SET `value`='2.0.0-beta4' WHERE `name`='thelia_version';
 UPDATE `config` SET `value`='beta4' WHERE `name`='thelia_extra_version';
 
+-- Preferred locale for admin users
+ALTER TABLE `admin` ADD `locale` VARCHAR(45) NOT NULL;
 UPDATE `admin` SET `locale`='en_US';
 
+-- Unknown flag image path
+INSERT INTO `config` (`name`, `value`, `secured`, `hidden`, `created_at`, `updated_at`) VALUES
+('unknown-flag-path','assets/img/flags/unknown.png', 1, 1, NOW(), NOW());
+
 SET FOREIGN_KEY_CHECKS = 1;
\ No newline at end of file
diff --git a/templates/backOffice/default/admin-layout.tpl b/templates/backOffice/default/admin-layout.tpl
index 8775c60d1..4e04f15be 100644
--- a/templates/backOffice/default/admin-layout.tpl
+++ b/templates/backOffice/default/admin-layout.tpl
@@ -84,7 +84,7 @@
                                 <div class="btn-group">
                                     {loop type="lang" name="ui-lang" id="{lang attr='id'}"}
                                     <button class="btn btn-default">
-                                        <img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="$TITLE" /> {$CODE|ucfirst}</a>
+                                        <img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" /> {$CODE|ucfirst}</a>
                                     </button>
                                     {/loop}
 
@@ -93,7 +93,7 @@
                                     </button>
                                     <ul class="dropdown-menu">
                                         {loop type="lang" name="ui-lang"}
-                                        <li><a href="{url path="{navigate to="current"}" lang={$CODE}}"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="$TITLE" /> {$CODE|ucfirst}</a></li>
+                                        <li><a href="{url path="{navigate to="current"}" lang={$CODE}}"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" /> {$CODE|ucfirst}</a></li>
                                         {/loop}
                                      </ul>
                                 </div>
diff --git a/templates/backOffice/default/ajax/language-update-modal.html b/templates/backOffice/default/ajax/language-update-modal.html
index 909b351b0..cc40933a9 100644
--- a/templates/backOffice/default/ajax/language-update-modal.html
+++ b/templates/backOffice/default/ajax/language-update-modal.html
@@ -18,6 +18,7 @@
         <div class="form-group {if $error}has-error{/if}">
             <label for="{$label_attr.for}" class="control-label">{intl l={$label}} : </label>
             <input type="text" id="{$label_attr.for}" name="{$name}" class="form-control" value="{$value}" title="{intl l={$label}}" placeholder="{intl l='Company'}">
+            <span class="help-block">{intl l='<a href="http://en.wikipedia.org/wiki/ISO_639-1_language_matrix" target="_other">Check the list</a> of ISO 639-1 codes'}</span>
         </div>
     {/form_field}
 
@@ -32,6 +33,7 @@
         <div class="form-group {if $error}has-error{/if}">
             <label for="{$label_attr.for}" class="control-label">{intl l={$label}} : </label>
             <input type="text" id="{$label_attr.for}" name="{$name}" class="form-control" value="{$value}" title="{intl l={$label}}" placeholder="{intl l='Company'}">
+            <span class="help-block">{intl l='The syntax used is identical to the PHP <a href="http://www.php.net/date" target="_other">date()</a> function'}</span>
         </div>
     {/form_field}
 
@@ -39,6 +41,7 @@
         <div class="form-group {if $error}has-error{/if}">
             <label for="{$label_attr.for}" class="control-label">{intl l={$label}} : </label>
             <input type="text" id="{$label_attr.for}" name="{$name}" class="form-control" value="{$value}" title="{intl l={$label}}" placeholder="{intl l='Company'}">
+            <span class="help-block">{intl l='The syntax used is identical to the PHP <a href="http://www.php.net/date" target="_other">date()</a> function'}</span>
         </div>
     {/form_field}
 
@@ -53,7 +56,7 @@
     dialog_title = {intl l="Edit a language"}
     dialog_body  = {$smarty.capture.edit_lang_dialog nofilter}
 
-dialog_ok_label     = {intl l="Edit this language"}
+dialog_ok_label     = {intl l="Save changes"}
 dialog_cancel_label = {intl l="Cancel"}
 
 form_action        = {url path="/admin/configuration/languages/save/{$lang_id}"}
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diff --git a/templates/backOffice/default/assets/img/flags/us.png b/templates/backOffice/default/assets/img/flags/us.png
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index 000000000..31aa3f187
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diff --git a/templates/backOffice/default/assets/img/flags/uy.png b/templates/backOffice/default/assets/img/flags/uy.png
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index 000000000..9397cece5
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diff --git a/templates/backOffice/default/assets/img/flags/uz.png b/templates/backOffice/default/assets/img/flags/uz.png
new file mode 100644
index 000000000..1df6c8822
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diff --git a/templates/backOffice/default/assets/img/flags/va.png b/templates/backOffice/default/assets/img/flags/va.png
new file mode 100644
index 000000000..25a852e90
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diff --git a/templates/backOffice/default/assets/img/flags/vc.png b/templates/backOffice/default/assets/img/flags/vc.png
new file mode 100644
index 000000000..e63a9c1d9
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diff --git a/templates/backOffice/default/assets/img/flags/ve.png b/templates/backOffice/default/assets/img/flags/ve.png
new file mode 100644
index 000000000..875f7733f
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diff --git a/templates/backOffice/default/assets/img/flags/vg.png b/templates/backOffice/default/assets/img/flags/vg.png
new file mode 100644
index 000000000..0bd002e4b
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diff --git a/templates/backOffice/default/assets/img/flags/vi.png b/templates/backOffice/default/assets/img/flags/vi.png
new file mode 100644
index 000000000..69d667a5a
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diff --git a/templates/backOffice/default/assets/img/flags/vn.png b/templates/backOffice/default/assets/img/flags/vn.png
new file mode 100644
index 000000000..69d87f909
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diff --git a/templates/backOffice/default/assets/img/flags/vu.png b/templates/backOffice/default/assets/img/flags/vu.png
new file mode 100644
index 000000000..5401c2a6d
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diff --git a/templates/backOffice/default/assets/img/flags/wf.png b/templates/backOffice/default/assets/img/flags/wf.png
new file mode 100644
index 000000000..922b74e26
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diff --git a/templates/backOffice/default/assets/img/flags/ws.png b/templates/backOffice/default/assets/img/flags/ws.png
new file mode 100644
index 000000000..d1f62df10
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diff --git a/templates/backOffice/default/assets/img/flags/ye.png b/templates/backOffice/default/assets/img/flags/ye.png
new file mode 100644
index 000000000..bad5e1f42
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diff --git a/templates/backOffice/default/assets/img/flags/yt.png b/templates/backOffice/default/assets/img/flags/yt.png
new file mode 100644
index 000000000..676e06ca7
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diff --git a/templates/backOffice/default/assets/img/flags/za.png b/templates/backOffice/default/assets/img/flags/za.png
new file mode 100644
index 000000000..701e01061
Binary files /dev/null and b/templates/backOffice/default/assets/img/flags/za.png differ
diff --git a/templates/backOffice/default/assets/img/flags/zm.png b/templates/backOffice/default/assets/img/flags/zm.png
new file mode 100644
index 000000000..e3d80780d
Binary files /dev/null and b/templates/backOffice/default/assets/img/flags/zm.png differ
diff --git a/templates/backOffice/default/assets/img/flags/zw.png b/templates/backOffice/default/assets/img/flags/zw.png
new file mode 100644
index 000000000..79864d469
Binary files /dev/null and b/templates/backOffice/default/assets/img/flags/zw.png differ
diff --git a/templates/backOffice/default/attribute-edit.html b/templates/backOffice/default/attribute-edit.html
index 7c82d8b9d..e8058983b 100644
--- a/templates/backOffice/default/attribute-edit.html
+++ b/templates/backOffice/default/attribute-edit.html
@@ -223,7 +223,7 @@
                 {loop type="lang" name="current-edit-lang" id="$edit_language_id"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Attribute title'}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l="Enter here the value in the current edit language (%title)" title=$TITLE}</div>
diff --git a/templates/backOffice/default/attributes.html b/templates/backOffice/default/attributes.html
index 2fcb8b0ed..1994c2e76 100644
--- a/templates/backOffice/default/attributes.html
+++ b/templates/backOffice/default/attributes.html
@@ -166,7 +166,7 @@
                 {loop type="lang" name="default-lang" default_only="1"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Attribute title'}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l="Enter here the attribute name in the default language (%language_name)" language_name=$TITLE}</div>
diff --git a/templates/backOffice/default/categories.html b/templates/backOffice/default/categories.html
index a3b3bb4a9..a0b43145c 100644
--- a/templates/backOffice/default/categories.html
+++ b/templates/backOffice/default/categories.html
@@ -373,7 +373,7 @@
                 {loop type="lang" name="default-lang" default_only="1"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Category title'}" placeholder="{intl l='Name'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="$TITLE" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l='Enter here the category name in the default language (%title)' title="$TITLE"}</div>
@@ -457,7 +457,7 @@
                 {loop type="lang" name="default-lang" default_only="1" backend_context="1"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{$label}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="$TITLE" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l='Enter here the product name in the default language (%title)' title="$TITLE"}</div>
diff --git a/templates/backOffice/default/currencies.html b/templates/backOffice/default/currencies.html
index 21784fd3b..6e1d29fc5 100644
--- a/templates/backOffice/default/currencies.html
+++ b/templates/backOffice/default/currencies.html
@@ -219,7 +219,7 @@
 			        {loop type="lang" name="default-lang" default_only="1"}
 			            <div class="input-group">
 			                <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Currency name'}" placeholder="{intl l='Name'}">
-			                <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+			                <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
 			            </div>
 
 			            <div class="help-block">{intl l="Enter here the currency name in the default language (%title)" title=$TITLE}</div>
diff --git a/templates/backOffice/default/feature-edit.html b/templates/backOffice/default/feature-edit.html
index 0f9d2d652..8c19ed761 100644
--- a/templates/backOffice/default/feature-edit.html
+++ b/templates/backOffice/default/feature-edit.html
@@ -223,7 +223,7 @@
                 {loop type="lang" name="current-edit-lang" id="$edit_language_id"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Feature title'}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l="Enter here the value in the current edit language (%language_name)" language_name=$TITLE}</div>
diff --git a/templates/backOffice/default/features.html b/templates/backOffice/default/features.html
index 281b06eb1..b44679348 100644
--- a/templates/backOffice/default/features.html
+++ b/templates/backOffice/default/features.html
@@ -166,7 +166,7 @@
                 {loop type="lang" name="default-lang" default_only="1"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Feature title'}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l="Enter here the feature name in the default language (%title)" title=$TITLE}</div>
diff --git a/templates/backOffice/default/folders.html b/templates/backOffice/default/folders.html
index 286270abc..0557d79ac 100644
--- a/templates/backOffice/default/folders.html
+++ b/templates/backOffice/default/folders.html
@@ -360,7 +360,7 @@
                 {loop type="lang" name="default-lang" default_only="1"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Folder title'}" placeholder="{intl l='Name'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="$TITLE" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l='Enter here the folder name in the default language (%title)' title="$TITLE"}</div>
@@ -432,7 +432,7 @@
     {loop type="lang" name="default-lang" default_only="1"}
     <div class="input-group">
         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{$label}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="$TITLE" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" /></span>
                             </div>
 
                             <div class="help-block">{intl l='Enter here the content name in the default language (%title)' title="$TITLE"}</div>
diff --git a/templates/backOffice/default/includes/inner-form-toolbar.html b/templates/backOffice/default/includes/inner-form-toolbar.html
index 88f2781d5..6e7835e73 100644
--- a/templates/backOffice/default/includes/inner-form-toolbar.html
+++ b/templates/backOffice/default/includes/inner-form-toolbar.html
@@ -17,7 +17,7 @@ Parameters:
 		    {loop name="lang_list" type="lang"}
 		    <li {if $ID == $edit_language_id}class="active"{/if}>
 		        <a class="language-change-button" data-language-id="{$ID}" href="{url path={$page_url|default:$current_url nofilter} edit_language_id=$ID}" title="{intl l='Edit information in %lng' lng=$TITLE}">
-		            <img src="{image file="../assets/img/flags/{$CODE}.gif"}" alt="$TITLE" />
+		            <img src="{image file="../assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" />
 		        </a>
 		    </li>
 		    {/loop}
diff --git a/templates/backOffice/default/languages.html b/templates/backOffice/default/languages.html
index 1fe374444..3054db1c0 100644
--- a/templates/backOffice/default/languages.html
+++ b/templates/backOffice/default/languages.html
@@ -187,6 +187,7 @@
             <div class="form-group {if $error}has-error{/if}">
                 <label for="{$label_attr.for}" class="control-label">{$label} : </label>
                 <input type="text" id="{$label_attr.for}" name="{$name}" class="form-control" value="{$value}" title="{$label}" placeholder="{intl l='ISO Code'}">
+                <span class="help-block">{intl l='<a href="http://en.wikipedia.org/wiki/ISO_639-1_language_matrix" target="_other">Check the list</a> of ISO 639-1 codes'}</span>
             </div>
         {/form_field}
         {form_field form=$form field='locale'}
@@ -199,12 +200,14 @@
             <div class="form-group {if $error}has-error{/if}">
                 <label for="{$label_attr.for}" class="control-label">{$label} : </label>
                 <input type="text" id="{$label_attr.for}" name="{$name}" class="form-control" value="{$value}" title="{$label}" placeholder="{intl l='d-m-Y'}">
+                <span class="help-block">{intl l='The syntax used is identical to the PHP <a href="http://www.php.net/date" target="_other">date()</a> function'}</span>
             </div>
         {/form_field}
         {form_field form=$form field='time_format'}
             <div class="form-group {if $error}has-error{/if}">
                 <label for="{$label_attr.for}" class="control-label">{$label} : </label>
                 <input type="text" id="{$label_attr.for}" name="{$name}" class="form-control" value="{$value}" title="{$label}" placeholder="{intl l='H:i:s'}">
+                <span class="help-block">{intl l='The syntax used is identical to the PHP <a href="http://www.php.net/date" target="_other">date()</a> function'}</span>
             </div>
         {/form_field}
 
diff --git a/templates/backOffice/default/messages.html b/templates/backOffice/default/messages.html
index e64f81d87..6344aa45b 100644
--- a/templates/backOffice/default/messages.html
+++ b/templates/backOffice/default/messages.html
@@ -143,7 +143,7 @@
 
 	                <div class="input-group">
 	                    <input type="text" id="{$label_attr.for}" {if $required}required="required"{/if} name="{$name}" value="{$value}" title="{intl l='Mailing template purpose'}" placeholder="{intl l='Mailing template purpose'}" class="form-control">
-	                    <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+	                    <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
 	                </div>
 
 	                <div class="help-block">{intl l="Enter here the mailing template purpose in the default language (%title)" title=$TITLE}</div>
diff --git a/templates/backOffice/default/templates.html b/templates/backOffice/default/templates.html
index 880c35747..2fa5d61b9 100644
--- a/templates/backOffice/default/templates.html
+++ b/templates/backOffice/default/templates.html
@@ -138,7 +138,7 @@
                 {loop type="lang" name="default-lang" default_only="1"}
                     <div class="input-group">
                         <input type="text" id="{$label_attr.for}" required="required" name="{$name}" class="form-control" value="{$value}" title="{intl l='Template title'}" placeholder="{intl l='Title'}">
-                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+                        <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
                     </div>
 
                     <div class="help-block">{intl l="Enter here the template name in the default language (%title)" title=$TITLE}</div>
diff --git a/templates/backOffice/default/translations.html b/templates/backOffice/default/translations.html
index e209dcfcf..bbcd7c6c0 100644
--- a/templates/backOffice/default/translations.html
+++ b/templates/backOffice/default/translations.html
@@ -178,7 +178,7 @@
 											<div class="panel panel-default">
 											    <div class="panel-heading">
                                                     {loop name="lang_list" type="lang" id=$edit_language_id}
-                                                        <img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{$TITLE}" />
+                                                        <img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{$TITLE}" />
                                                     {/loop}
 
                                                     {$label} {$file_names nofilter}
diff --git a/templates/backOffice/default/variables.html b/templates/backOffice/default/variables.html
index 89f0a423c..a6433a023 100644
--- a/templates/backOffice/default/variables.html
+++ b/templates/backOffice/default/variables.html
@@ -186,7 +186,7 @@
 
 		            <div class="input-group">
 		              <input type="text" id="{$label_attr.for}" required="required" name="{$name}" value="{$value}" title="{intl l='Variable purpose'}" placeholder="{intl l='Variable purpose'}" class="form-control">
-		              <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.gif"}" alt="{intl l=$TITLE}" /></span>
+		              <span class="input-group-addon"><img src="{image file="assets/img/flags/{$CODE}.png"}" alt="{intl l=$TITLE}" /></span>
 		            </div>
 
 		            <div class="help-block">{intl l='Enter here the category name in the default language (%title)' title="$TITLE"}</div>