Android FB app stuck at "just a moment while we set up English (united kingdom)

Hi there. I've been using a few android apps on my Q10 for some time, and, following advice on here I just installed Snap in order to update them.

Dolphin and VideoLan updated nicely, but the Facebook app just gets stuck at the loading english UK stage.

FB always has been very slow to open, which is one reason I tried the update, but I can't see any way to get the new one past the looking for English stage.

I've tried resets and battery pulls with no success. (Actually this was quite lucky, as I found my battery was swollen alarmingly, when I took the back off! So I may have ordered a new on just in time as a result of this experiment!)

Many thanks for any useful advice.