Index: branches/RC/core/units/languages/languages_item.php
===================================================================
diff -u -r8929 -r9363
--- branches/RC/core/units/languages/languages_item.php	(.../languages_item.php)	(revision 8929)
+++ branches/RC/core/units/languages/languages_item.php	(.../languages_item.php)	(revision 9363)
@@ -8,16 +8,17 @@
 			return $this->Conn->GetOne($sql) + 1;
 		}
 
-		function setPrimary($reset_primary = true)
+		function setPrimary($reset_primary = true, $admin_language = false)
 		{
+			$primary_field = $admin_language ? 'AdminInterfaceLang' : 'PrimaryLang';
 			if ($reset_primary) {
 				$sql = 'UPDATE '.$this->TableName.'
-						SET PrimaryLang = 0';
+						SET '.$primary_field.' = 0';
 				$this->Conn->Query($sql);
 			}
 
 			$sql = 'UPDATE '.$this->TableName.'
-					SET PrimaryLang = 1, Enabled = 1
+					SET '.$primary_field.' = 1, Enabled = 1
 					WHERE '.$this->IDField.' = '.$this->GetID();
 			$this->Conn->Query($sql);
 		}