[Eric] How to set/reset GUI language preference

[Mike Morris]

After a crash, my eric6 is now in German rather than my default English.

FYI: I'm on Ubuntu 16.04 linux, 64 bit with eric6 18.05 recently 
installed (from tarball).

I don't see any language setting in Preferences at all... so I've tried 
to figure out how Qt might be affecting it, but I know nothing of it, so 
no progress there.

I've completely removed my ".eric6" prefs directory, and my most recent 
project directory as well. (Just renaming them out of the way...) but no 
help.

The only way I've gotten it to startup in English again is by logging in 
as a different user.

Any pointers greatly appreciated!