I recently updated my Piwigo instance to version 15. Not out of a real need, but rather just because it’s good to stay current with software updates. This is the first time I ran into an issue, which I caused but didn’t expect.
I deactivated and deleted most languages, and I also switched my default from “English [GB]” to “English [US]. A mistake as I later found out.
I started to have errors in the User manager, in the photos, on the dashboard.
I also added the errors here in text.
Warning: Undefined array key "day" in /home/***/www/***/admin/intro.php on line 333
Warning: Trying to access array offset on value of type null in /home/***/www/***/admin/intro.php on line 333
Deprecated: mb_substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home/***/www/***/admin/intro.php on line 333I attempted to download the language for my version from the Piwigo website as I not only deactivated the language, but immediately deleted them.
Those language packs are 14 years old and are no longer usable at this point. I couldn’t find any information about it in the community or in the documentation.
The option “add new language” was also of no help, I’m not sure if it’s some legacy leftovers. But it didn’t show any controls in my case.
The best option that came to my mind now was that the language pack is bundled with the new instance. So I should be able to take it from a fresh copy and add it to my instance. So I went ahead and downloaded the fresh Piwigo 15 from the website.
I brought back the folder using WinSCP from the server.
Once you accomplish this, you need to switch to your Piwigo and activate the language.
This is the final view, both English [UK] and English [GB], are back which resolved every error I previously saw in the UI.
This process should also help you if you got too fast and removed languages you later missed or accidentally deleted too much.