All programs opened in SU mode are in German. I tried opening kcontrol from Konsole in SU mode to try to set the language, but I get this error:

lib: connection to ":0.0" refused by server
Xlib: No protocol specified

kdeinit: Can't connect to the X Server.
kdeinit: Might not terminate at end of session.
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

kded: cannot connect to X server :0.0
kded: ERROR: KUniqueApplication: Registering failed!
kded: ERROR: Communication problem with kded, it probably crashed.
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

kcontrol: cannot connect to X server :0.0
ERROR: KUniqueApplication: Registering failed!
ERROR: Communication problem with kcontrol, it probably crashed.

Is there a way to change the language settings. Forgive me for being a n00b.