It seems that the native app is trying to do Spell Check in card descriptions, and I don’t see how to disable it.
My OS is in Spanish, but I write in English in Fibery, so everything is “red.” In the web version, I have disabled Chrome spell check, and everything is fine.
Sorry to revive this thread but it seems like the latest update has caused the spell-checker to be completely disabled. I wasn’t able to find any options (even in the hidden top-menu) to enable it in the app.