// do not use sprintf when it is useless

install-dev/classes/languages.php

@@ -136,7 +136,9 @@ class InstallLanguages
 		}
 
 		$args[0] = $translation;
-		return call_user_func_array('sprintf', $args);
+		if(count($args) > 1)
+			return call_user_func_array('sprintf', $args);
+		else return $translation;
 	}
 
 	/**