hmh, but that is nothing WhatsApp specific, but rather keyboard specific afaik: I use OpenBoard and I can set different languages for auto correction:
I suggest to check your keyboard settings. There, you should be able to choose the autocorrection languages
Which brightness issue do you mean) This one? I might have to check our FP4 with iodéOS if it is present there too. But since custom ROMs rely on the firmware blobs Fairphone provides, this issue might effect most of them.
That being said: In our use case all banking and payment apps are working flawlessly. However, we don’t use Google Pay.
I am happy with the standard launcher so far. But you could have a look at the different launchers available at F-Droid