fix(#94): Set default language when updating version

Updates the call to $version->update to use 'default' as the language if $lang is null. This ensures that a valid language is always provided during the update process.

Author: afbora

commands/clean/content.php

@@ -49,7 +49,7 @@
 			// check if the version exists for the given language
 			// and try to update the page with the data
 			if ($version->exists($lang) === true) {
-				$version->update($data, $lang);
+				$version->update($data, $lang ?? 'default');
 			}
 		}
 	}