gnome-photos: Fixed a typo in a string marked for translation

[Debarshi Ray <rishi is lostca se>]

Hello everybody,

Jeremy just fixed [1] a spelling mistake in a string that was marked for
translation:
- "Your %s crendentials have expired"
+ "Your %s credentials have expired"

He also fixed all affected translations. Hence, I expect the change to be
transparent, but I thought I'd just let you know.

Thanks for your work, and sorry for the typo!

Cheers,
Rishi

[1] https://bugzilla.gnome.org/show_bug.cgi?id=778967