diff --git a/classes/Language.php b/classes/Language.php
index e90700112..ce3762ab2 100644
--- a/classes/Language.php
+++ b/classes/Language.php
@@ -691,6 +691,7 @@ class LanguageCore extends ObjectModel
 		// Initialize the language
 		$lang = new Language();
 		$lang->iso_code = $iso_code;
+		$lang->language_code = $iso_code;
 		$lang->active = true;
 
 		// If the language pack has not been provided, retrieve it from prestashop.com
@@ -700,13 +701,15 @@ class LanguageCore extends ObjectModel
 		// If a language pack has been found or provided, prefill the language object with the value
 		if ($lang_pack)
 			foreach (get_object_vars($lang_pack) as $key => $value)
-				$lang->$key = $value;
+				if ($key != 'iso_code' && isset(Language::$definition['fields'][$key]))
+					$lang->$key = $value;
 
 		// Use the values given in parameters to override the data retrieved automatically
 		if ($params_lang !== null && is_array($params_lang))
 			foreach ($params_lang as $key => $value)
-				$lang->$key = $value;
-		
+				if ($key != 'iso_code' && isset(Language::$definition['fields'][$key]))
+					$lang->$key = $value;
+
 		if (!$lang->add(true, false, $only_add))
 			return false;
 
@@ -724,7 +727,7 @@ class LanguageCore extends ObjectModel
 		}
 		else
 			Language::_copyNoneFlag((int)$lang->id);
-	
+
 		$files_copy = array(
 			'/en.jpg',
 			'/en-default-'.ImageType::getFormatedName('thickbox').'.jpg',
@@ -734,7 +737,7 @@ class LanguageCore extends ObjectModel
 			'/en-default-'.ImageType::getFormatedName('small').'.jpg',
 			'/en-default-'.ImageType::getFormatedName('scene').'.jpg'
 		);
-		
+
 		foreach (array(_PS_CAT_IMG_DIR_, _PS_MANU_IMG_DIR_, _PS_PROD_IMG_DIR_, _PS_SUPP_IMG_DIR_) as $to)
 			foreach ($files_copy as $file)
 				@copy(dirname(__FILE__).'/../img/l'.$file, $to.str_replace('/en', '/'.$iso_code, $file));
diff --git a/controllers/admin/AdminImportController.php b/controllers/admin/AdminImportController.php
index 0c8fe2920..102f63027 100644
--- a/controllers/admin/AdminImportController.php
+++ b/controllers/admin/AdminImportController.php
@@ -928,7 +928,7 @@ class AdminImportControllerCore extends AdminController
 						$this->errors[] = sprintf(
 							Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 							$category_to_create->name[$default_language_id],
-							(isset($category_to_create->id) ? $category_to_create->id : 'null')
+							(isset($category_to_create->id) && !empty($category_to_create->id))? $category_to_create->id : 'null'
 						);
 						$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 							Db::getInstance()->getMsgError();
@@ -961,7 +961,7 @@ class AdminImportControllerCore extends AdminController
 				$this->warnings[] = sprintf(
 					Tools::displayError('Rewrite link for %1$s (ID: %2$s) was re-written as %3$s.'),
 					$bak,
-					(isset($info['id']) ? $info['id'] : 'null'),
+					(isset($info['id']) && !empty($info['id']))? $info['id'] : 'null',
 					$category->link_rewrite[$default_language_id]
 				);
 			$res = false;
@@ -1009,8 +1009,8 @@ class AdminImportControllerCore extends AdminController
 			{
 				$this->errors[] = sprintf(
 					Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
-					(isset($info['name']) ? Tools::safeOutput($info['name']) : 'No Name'),
-					(isset($info['id']) ? Tools::safeOutput($info['id']) : 'No ID')
+					(isset($info['name']) && !empty($info['name']))? Tools::safeOutput($info['name']) : 'No Name',
+					(isset($info['id']) && !empty($info['id']))? Tools::safeOutput($info['id']) : 'No ID'
 				);
 				$error_tmp = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').Db::getInstance()->getMsgError();
 				if ($error_tmp != '')
@@ -1138,7 +1138,7 @@ class AdminImportControllerCore extends AdminController
 						$this->errors[] = sprintf(
 							Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 							$manufacturer->name,
-							(isset($manufacturer->id) ? $manufacturer->id : 'null')
+							(isset($manufacturer->id) && !empty($manufacturer->id))? $manufacturer->id : 'null'
 						);
 						$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 							Db::getInstance()->getMsgError();
@@ -1169,7 +1169,7 @@ class AdminImportControllerCore extends AdminController
 						$this->errors[] = sprintf(
 							Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 							$supplier->name,
-							(isset($supplier->id) ? $supplier->id : 'null')
+							(isset($supplier->id) && !empty($supplier->id))? $supplier->id : 'null'
 						);
 						$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 							Db::getInstance()->getMsgError();
@@ -1215,7 +1215,7 @@ class AdminImportControllerCore extends AdminController
 								$this->errors[] = sprintf(
 									Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 									$category_to_create->name[$default_language_id],
-									(isset($category_to_create->id) ? $category_to_create->id : 'null')
+									(isset($category_to_create->id) && !empty($category_to_create->id))? $category_to_create->id : 'null'
 								);
 								$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 									Db::getInstance()->getMsgError();
@@ -1247,7 +1247,7 @@ class AdminImportControllerCore extends AdminController
 								$this->errors[] = sprintf(
 									Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 									$category_to_create->name[$default_language_id],
-									(isset($category_to_create->id) ? $category_to_create->id : 'null')
+									(isset($category_to_create->id) && !empty($category_to_create->id))? $category_to_create->id : 'null'
 								);
 								$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 									Db::getInstance()->getMsgError();
@@ -1274,11 +1274,11 @@ class AdminImportControllerCore extends AdminController
 				$this->warnings[] = sprintf(
 					Tools::displayError('Rewrite link for %1$s (ID: %2$s) was re-written as %3$s.'),
 					$product->name[$id_lang],
-					(isset($info['id']) ? $info['id'] : 'null'),
+					(isset($info['id']) && !empty($info['id']))? $info['id'] : 'null',
 					$link_rewrite
 				);
 
-			if (!Tools::getValue('match_ref') || !(is_array($product->link_rewrite) && count($product->link_rewrite)))
+			if (!Tools::getValue('match_ref') || !(is_array($product->link_rewrite) && count($product->link_rewrite) && !empty($product->link_rewrite[$id_lang])))
 				$product->link_rewrite = AdminImportController::createMultiLangField($link_rewrite);
 
 			// replace the value of separator by coma
@@ -1357,8 +1357,8 @@ class AdminImportControllerCore extends AdminController
 			{
 				$this->errors[] = sprintf(
 					Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
-					(isset($info['name']) ? Tools::safeOutput($info['name']) : 'No Name'),
-					(isset($info['id']) ? Tools::safeOutput($info['id']) : 'No ID')
+					(isset($info['name']) && !empty($info['name']))? Tools::safeOutput($info['name']) : 'No Name',
+					(isset($info['id']) && !empty($info['id']))? Tools::safeOutput($info['id']) : 'No ID'
 				);
 				$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 					Db::getInstance()->getMsgError();
@@ -1964,7 +1964,7 @@ class AdminImportControllerCore extends AdminController
 				$this->errors[] = sprintf(
 					Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 					$info['email'],
-					(isset($info['id']) ? $info['id'] : 'null')
+					(isset($info['id']) && !empty($info['id']))? $info['id'] : 'null'
 				);
 				$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 					Db::getInstance()->getMsgError();
@@ -2061,7 +2061,7 @@ class AdminImportControllerCore extends AdminController
 							Tools::displayError('%1$s does not exist in database %2$s (ID: %3$s) cannot be saved'),
 							Db::getInstance()->getMsgError(),
 							$address->customer_email,
-							(isset($info['id']) ? $info['id'] : 'null')
+							(isset($info['id']) && !empty($info['id']))? $info['id'] : 'null'
 						);
 				}
 				else
@@ -2110,7 +2110,7 @@ class AdminImportControllerCore extends AdminController
 					$this->errors[] = Db::getInstance()->getMsgError().' '.sprintf(
 						Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 						$manufacturer->name,
-						(isset($manufacturer->id) ? $manufacturer->id : 'null')
+						(isset($manufacturer->id) && !empty($manufacturer->id))? $manufacturer->id : 'null'
 					);
 					$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 						Db::getInstance()->getMsgError();
@@ -2131,7 +2131,7 @@ class AdminImportControllerCore extends AdminController
 					$this->errors[] = Db::getInstance()->getMsgError().' '.sprintf(
 						Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 						$supplier->name,
-						(isset($supplier->id) ? $supplier->id : 'null')
+						(isset($supplier->id) && !empty($supplier->id))? $supplier->id : 'null'
 					);
 					$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 						Db::getInstance()->getMsgError();
@@ -2160,7 +2160,7 @@ class AdminImportControllerCore extends AdminController
 							$this->errors[] = sprintf(
 								Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 								$info['alias'],
-								(isset($info['id']) ? $info['id'] : 'null')
+								(isset($info['id']) && !empty($info['id']))? $info['id'] : 'null'
 							);
 					}
 				}
@@ -2177,7 +2177,7 @@ class AdminImportControllerCore extends AdminController
 				$this->errors[] = sprintf(
 					Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
 					$info['alias'],
-					(isset($info['id']) ? $info['id'] : 'null')
+					(isset($info['id']) && !empty($info['id']))? $info['id'] : 'null'
 				);
 				$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 					Db::getInstance()->getMsgError();
@@ -2247,8 +2247,8 @@ class AdminImportControllerCore extends AdminController
 			{
 				$this->errors[] = Db::getInstance()->getMsgError().' '.sprintf(
 					Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
-					(isset($info['name']) ? Tools::safeOutput($info['name']) : 'No Name'),
-					(isset($info['id']) ? Tools::safeOutput($info['id']) : 'No ID')
+					(isset($info['name']) && !empty($info['name']))? Tools::safeOutput($info['name']) : 'No Name',
+					(isset($info['id']) && !empty($info['id']))? Tools::safeOutput($info['id']) : 'No ID'
 				);
 				$this->errors[] = ($field_error !== true ? $field_error : '').(isset($lang_field_error) && $lang_field_error !== true ? $lang_field_error : '').
 					Db::getInstance()->getMsgError();
@@ -2294,8 +2294,8 @@ class AdminImportControllerCore extends AdminController
 				if (!$res)
 					$this->errors[] = Db::getInstance()->getMsgError().' '.sprintf(
 						Tools::displayError('%1$s (ID: %2$s) cannot be saved'),
-						(isset($info['name']) ? Tools::safeOutput($info['name']) : 'No Name'),
-						(isset($info['id']) ? Tools::safeOutput($info['id']) : 'No ID')
+						(isset($info['name']) && !empty($info['name']))? Tools::safeOutput($info['name']) : 'No Name',
+						(isset($info['id']) && !empty($info['id']))? Tools::safeOutput($info['id']) : 'No ID'
 					);
 				else
 				{
diff --git a/controllers/admin/AdminProductsController.php b/controllers/admin/AdminProductsController.php
index 03764fe67..cbc235f59 100644
--- a/controllers/admin/AdminProductsController.php
+++ b/controllers/admin/AdminProductsController.php
@@ -2023,7 +2023,7 @@ class AdminProductsControllerCore extends AdminController
 		// Check multilingual fields validity
 		foreach ($rules['validateLang'] as $fieldLang => $function)
 			foreach ($languages as $language)
-				if ($this->isProductFieldUpdated('description_short', $language['id_lang']) && ($value = Tools::getValue($fieldLang.'_'.$language['id_lang'])))
+				if ($this->isProductFieldUpdated($fieldLang, $language['id_lang']) && ($value = Tools::getValue($fieldLang.'_'.$language['id_lang'])))
 					if (!Validate::$function($value, (int)Configuration::get('PS_ALLOW_HTML_IFRAME')))
 						$this->errors[] = sprintf(
 							Tools::displayError('The %1$s field (%2$s) is invalid.'),
diff --git a/modules/productcomments/productcomments.tpl b/modules/productcomments/productcomments.tpl
index f8fe9f111..0c5c3aecb 100644
--- a/modules/productcomments/productcomments.tpl
+++ b/modules/productcomments/productcomments.tpl
@@ -76,11 +76,13 @@ var moderation_active = {$moderation_active};
 			</div>
 			{/if}
 		{/foreach}
+        {if (!$too_early AND ($logged OR $allow_guests))}
 		<p class="align_center">
 			<a id="new_comment_tab_btn" class="open-comment-form" href="#new_comment_form">{l s='Write your review' mod='productcomments'} !</a>
 		</p>
+        {/if}
 	{else}
-		{if ($too_early == false AND ($logged OR $allow_guests))}
+		{if (!$too_early AND ($logged OR $allow_guests))}
 		<p class="align_center">
 			<a id="new_comment_tab_btn" class="open-comment-form" href="#new_comment_form">{l s='Be the first to write your review' mod='productcomments'} !</a>
 		</p>
diff --git a/themes/default/modules/productcomments/productcomments.tpl b/themes/default/modules/productcomments/productcomments.tpl
index 3cb407777..bbd737670 100644
--- a/themes/default/modules/productcomments/productcomments.tpl
+++ b/themes/default/modules/productcomments/productcomments.tpl
@@ -76,11 +76,13 @@ var moderation_active = {$moderation_active};
 			</div>
 			{/if}
 		{/foreach}
+        {if (!$too_early AND ($logged OR $allow_guests))}
 		<p class="align_center">
 			<a id="new_comment_tab_btn" class="open-comment-form" href="#new_comment_form">{l s='Write your review' mod='productcomments'} !</a>
 		</p>
+        {/if}
 	{else}
-		{if ($too_early == false AND ($logged OR $allow_guests))}
+		{if (!$too_early AND ($logged OR $allow_guests))}
 		<p class="align_center">
 			<a id="new_comment_tab_btn" class="open-comment-form" href="#new_comment_form">{l s='Be the first to write your review' mod='productcomments'} !</a>
 		</p>
@@ -141,7 +143,7 @@ var moderation_active = {$moderation_active};
 				{/if}
 
 				<div id="new_comment_form_footer">
-					<input id="id_product_comment_send" name="id_product" type="hidden" value='{$id_product_comment_form}'></input>
+					<input id="id_product_comment_send" name="id_product" type="hidden" value='{$id_product_comment_form}' />
 					<p class="fl required"><sup>*</sup> {l s='Required fields' mod='productcomments'}</p>
 					<p class="fr">
 						<button id="submitNewMessage" name="submitMessage" type="submit">{l s='Send' mod='productcomments'}</button>&nbsp;