After enabling the module on a site that uses l10n_update, I got an AJAX error during the installation of the translations. This error now persists when installing other modules or updating the localizations:

Ein AJAX-HTTP-Fehler ist aufgetreten. HTTP-Rückgabe-Code: 500 Im Folgenden finden Sie Debugging-Informationen. Pfad: /batch?id=45&op=do Statustext: Internal Server Error Antworttext:

Additionally, after returning to the list of modules, I get the following error messages multiple times:

Warning: hash_file(sites/all/modules/l10n_update/includes/gettext/PoHeader.php): failed to open stream: Permission denied in _registry_parse_files() (Zeile 135 von /home/sites/site201/web_drupal7/includes/registry.inc).
Warning: file_get_contents(sites/all/modules/l10n_update/includes/gettext/PoHeader.php): failed to open stream: Permission denied in _registry_parse_files() (Zeile 143 von /home/sites/site201/web_drupal7/includes/registry.inc).