A few days ago I added French and German to the preferred translation settings (but kept US English first in the list).
I also added French and German in the additional languages (keeping US English the main language).
Since then I have issues on my system.
e.g. a zypper commande would give an output part in French, part in German, part in English.
SO I removed the languages from those settings, now only the application names are stuck in German (Online-Aktualisierung vs Online-Update, etc.).
# grep -v "#" /etc/sysconfig/language
INPUT_METHOD=""
RC_LANG="en_US.UTF-8"
RC_LC_ALL=""
RC_LC_MESSAGES=""
RC_LC_CTYPE=""
RC_LC_COLLATE=""
RC_LC_TIME=""
RC_LC_NUMERIC=""
RC_LC_MONETARY=""
RC_LC_PAPER=""
ROOT_USES_LANG="ctype"
AUTO_DETECT_UTF8="no"
INSTALLED_LANGUAGES="en_US"
Any ideas ?