Switch from en-US to en-GB results in 500


I switched the culture of a site from en-US to en-UK with some existing Helfereline modules on it.
All these modules result in a 500 error after that, I guess because all the fileds are marked as en-US.
New modules do work correctly.
Would be nice to handle this somehow

FYI, I used this SQL statement as a workaround to correct the issue in the database:

UPDATE helferlein_BabelFish
SET Locale = 'en-GB'
WHERE (PortalID = 0) AND (Locale = 'en-US')