http://bugs.winehq.org/show_bug.cgi?id=29924
--- Comment #4 from Julian Rüger jr98@gmx.net 2012-03-16 08:43:26 CDT --- Confirming.
I could not reproduce this until I replaced fr_FR with my system's current locale.
In other words:
LC_MESSAGES=en_GB.UTF-8 LC_CTYPE=fr_FR.UTF-8 ./wine control
seems to work fine on a non-french system, all strings in English, but e.g.
LC_MESSAGES=en_GB.UTF-8 LC_CTYPE=de_DE.UTF-8 ./wine control
for a German system shows a mixed German/English GUI.