Patch failed to apply during upgrade

I think the message ‘The locale file “” is missing or unreadable.’ is caused by a different number of locale files in the en_US translation of a plugin vs the other translations (such as COUNTER now does in 2.4.8). In the COUNTER and 2.4.8 example, the Translator plugin cannot correctly determine that the en_US ar1.xml and jr1.xml files should also exist as the same names in the other locales.

This won’t directly impact your install, except that you will not be able to use the Translator plugin to edit or create these files.

The fix for this issue will likely lie somewhere in TranslatorAction.inc.php’s testlocale():