You know all the languages in those menu bars?
I made a couple of little AppleScript apps to launch FileMaker Pro 18, 19 and Claris Pro in another language. So I can double click the French one and another instance of FileMaker Pro launches on my Mac with French localization.
We updated this to include Claris Pro, include Apple Silicon code and proper entitlements to avoid permission errors. You may still be asked once to allow automation, e.g. like this:
Please ty and let us know your feedback.