There could be two language selection options in Collect. One for the entire application and one for the selected published survey in Data Management (DM) instead of the create/edit record window if possible. This way the same language setting can be applied for all records at once.
This approach requires of course that the language setting in DM can override the language setting for the entire application but only for the current survey in DM. Is that doable?
I can confirm that changing my web browser's display language to Finnish and restarting Collect solved the issue. I like to use English as the default language in general when it comes to computers and software, so the option of language selection would be very welcome :)
Cheers!
Andras