Ja, passe Deine rc.conf wie folgt an:
# -----------------------------------------------------------------------
# LOCALIZATION
# -----------------------------------------------------------------------
#
# LOCALE: available languages can be listed with the 'locale -a' command
# HARDWARECLOCK: set to "UTC" or "localtime"
# TIMEZONE: timezones are found in /usr/share/zoneinfo
# KEYMAP: keymaps are found in /usr/share/kbd/keymaps
# CONSOLEFONT: found in /usr/share/kbd/consolefonts (only needed for non-US)
# CONSOLEMAP: found in /usr/share/kbd/unimaps
# USECOLOR: use ANSI color sequences in startup messages
#
LOCALE="de_DE.utf8"
HARDWARECLOCK="UTC"
TIMEZONE="Europe/Berlin"
KEYMAP="de-latin1-nodeadkeys"
CONSOLEFONT=
CONSOLEMAP=
USECOLOR="yes"
Firefox gibt es aber dennoch nicht in Deutsch.