Index: branches/RC/core/units/languages/languages_event_handler.php
===================================================================
diff -u -N -r11623 -r11674
--- branches/RC/core/units/languages/languages_event_handler.php	(.../languages_event_handler.php)	(revision 11623)
+++ branches/RC/core/units/languages/languages_event_handler.php	(.../languages_event_handler.php)	(revision 11674)
@@ -16,6 +16,7 @@
 				'OnExportLanguage'	=>	Array('self' => 'advanced:export'),
 				'OnExportProgress'	=>	Array('self' => 'advanced:export'),
 				'OnReflectMultiLingualFields' => Array ('self' => 'view'),
+				'OnSynchronizeLanguages' => Array ('self' => 'edit'),
 
 				'OnItemBuild' => Array('self' => true),
 			);
@@ -357,6 +358,60 @@
 			}
 		}
 
+		/**
+		 * Copy missing phrases across all system languages (starting from primary)
+		 *
+		 * @param kEvent $event
+		 */
+		function OnSynchronizeLanguages(&$event)
+		{
+			// get language list with primary language first
+			$sql = 'SELECT LanguageId
+					FROM ' . TABLE_PREFIX . 'Language
+					ORDER BY PrimaryLang DESC';
+
+			$source_langs = $this->Conn->GetCol($sql);
+			$target_langs = $source_langs;
+
+			foreach ($source_langs as $source_id) {
+				foreach ($target_langs as $target_id) {
+					if ($source_id == $target_id)	{
+						continue;
+					}
+
+					$this->_addMissingPhrase($source_id, $target_id);
+				}
+			}
+		}
+
+		/**
+		 * Copy missing phrases from $from_lang to $to_lang
+		 *
+		 * @param int $from_lang
+		 * @param int $to_lang
+		 */
+		function _addMissingPhrase($from_lang, $to_lang)
+		{
+			$tmp_name = TABLE_PREFIX . 'PhraseCopy_' . $this->Application->GetSID();
+			$q = 'CREATE TABLE ' . $tmp_name . '
+						SELECT
+							source.Phrase,
+							source.Translation,
+							source.PhraseType,
+							NULL As PhraseId,
+							' . $to_lang . ' AS LanguageId,
+							source.LastChanged,
+							source.LastChangeIP,
+							source.Module
+						FROM ' . TABLE_PREFIX . 'Phrase source
+						WHERE source.LanguageId = ' . $from_lang . '
+							AND source.Phrase NOT IN (SELECT Phrase FROM ' . TABLE_PREFIX . 'Phrase target WHERE target.LanguageId = ' . $to_lang . ')';
+			$this->Conn->Query($q);
+
+			$this->Conn->Query('INSERT INTO ' . TABLE_PREFIX . 'Phrase SELECT * FROM ' . $tmp_name);
+			$this->Conn->Query('DROP TABLE ' . $tmp_name);
+		}
+
 	}
 
 ?>
\ No newline at end of file
Index: branches/RC/core/install/english.lang
===================================================================
diff -u -N -r11661 -r11674
--- branches/RC/core/install/english.lang	(.../english.lang)	(revision 11661)
+++ branches/RC/core/install/english.lang	(.../english.lang)	(revision 11674)
@@ -1572,6 +1572,7 @@
 			<PHRASE Label="la_ShortToolTip_RescanThemes" Module="Core" Type="1">UmVzY2FuIFRoZW1lcw==</PHRASE>
 			<PHRASE Label="la_ShortToolTip_ResetSettings" Module="Core" Type="1">UmVzZXQ=</PHRASE>
 			<PHRASE Label="la_ShortToolTip_SetPrimary" Module="Core" Type="1">UHJpbWFyeQ==</PHRASE>
+			<PHRASE Label="la_ShortToolTip_SynchronizeLanguages" Module="Core" Type="1">U3luY2hyb25pemU=</PHRASE>
 			<PHRASE Label="la_ShortToolTip_Up" Module="Core" Type="1">VXA=</PHRASE>
 			<PHRASE Label="la_ShortToolTip_View" Module="Core" Type="1">Vmlldw==</PHRASE>
 			<PHRASE Label="la_Show" Module="Core" Type="1">U2hvdw==</PHRASE>
@@ -2285,6 +2286,7 @@
 			<PHRASE Label="la_ToolTip_SetPrimaryLanguage" Module="Core" Type="1">U2V0IFByaW1hcnkgTGFuZ3VhZ2U=</PHRASE>
 			<PHRASE Label="la_ToolTip_ShowMenu" Module="Core" Type="1">U2hvdyBNZW51</PHRASE>
 			<PHRASE Label="la_ToolTip_Stop" Module="Core" Type="1">Q2FuY2Vs</PHRASE>
+			<PHRASE Label="la_ToolTip_SynchronizeLanguages" Module="Core" Type="1">U3luY2hyb25pemUgTGFuZ3VhZ2Vz</PHRASE>
 			<PHRASE Label="la_ToolTip_Tools" Module="Core" Type="1">VG9vbHM=</PHRASE>
 			<PHRASE Label="la_ToolTip_Up" Module="Core" Type="1">VXAgYSBDYXRlZ29yeQ==</PHRASE>
 			<PHRASE Label="la_ToolTip_ValidateSelected" Module="Core" Type="1">VmFsaWRhdGU=</PHRASE>
Index: branches/RC/core/admin_templates/regional/languages_list.tpl
===================================================================
diff -u -N -r11623 -r11674
--- branches/RC/core/admin_templates/regional/languages_list.tpl	(.../languages_list.tpl)	(revision 11623)
+++ branches/RC/core/admin_templates/regional/languages_list.tpl	(.../languages_list.tpl)	(revision 11674)
@@ -45,6 +45,11 @@
 						}
 				 ) );
 
+				a_toolbar.AddButton( new ToolBarButton('refresh', '<inp2:m_phrase label="la_ToolTip_SynchronizeLanguages" escape="1"/>::<inp2:m_phrase label="la_ShortToolTip_SynchronizeLanguages" escape="1"/>', function() {
+						submit_event('lang', 'OnSynchronizeLanguages');
+					}
+				));
+
 				a_toolbar.AddButton( new ToolBarSeparator('sep2') );
 
 				a_toolbar.AddButton( new ToolBarButton('view', '<inp2:m_phrase label="la_ToolTip_View" escape="1"/>', function() {