Index: trunk/kernel/units/general/helpers/multilanguage.php
===================================================================
diff -u -r4029 -r4358
--- trunk/kernel/units/general/helpers/multilanguage.php	(.../multilanguage.php)	(revision 4029)
+++ trunk/kernel/units/general/helpers/multilanguage.php	(.../multilanguage.php)	(revision 4358)
@@ -43,6 +43,10 @@
 		{
 			$table_name = $this->Application->getUnitOption('lang', 'TableName');
 			$languages_count = $this->Conn->GetOne('SELECT COUNT(*) FROM '.$table_name);
+			if (!$languages_count) {
+				// during installation we have not languages, but we need to created custom field columns
+				$languages_count = 1;
+			}
 			return $languages_count + 5 - ( $languages_count % 5 ? ($languages_count % 5) : 5 );
 		}
 		
@@ -75,9 +79,14 @@
 		 * Creates missing multilanguage fields in table by specified prefix
 		 *
 		 * @param string $prefix
+		 * @param bool $refresh Forces config field structure to be re-read from database
 		 */
-		function createFields($prefix)
+		function createFields($prefix, $refresh = false)
 		{
+			if ($refresh) {
+				$this->Application->HandleEvent( new kEvent($prefix.':OnCreateCustomFields') );
+			}
+			
 			$table_name = $this->Application->getUnitOption($prefix, 'TableName');
 			$this->curFields = $this->Application->getUnitOption($prefix, 'Fields');