locale

export LC_ALL=ar_EG.UTF-8

ثم من نفس نافدة سطر الأوامر نفد

firefox

/etc/sysconfig/i18n

LANG=ar_EG.UTF-8
LC_ALL=ar_EG.UTF-8

locale

export LC_ALL=ar_EG.UTF-8

ثم من نفس نافدة سطر الأوامر نفد

firefox

[ahmed@ahmed ~]$ locale
LANG=ar_SA.utf8
LC_CTYPE="ar_SA.utf8"
LC_NUMERIC="ar_SA.utf8"
LC_TIME="ar_SA.utf8"
LC_COLLATE="ar_SA.utf8"
LC_MONETARY="ar_SA.utf8"
LC_MESSAGES="ar_SA.utf8"
LC_PAPER="ar_SA.utf8"
LC_NAME="ar_SA.utf8"
LC_ADDRESS="ar_SA.utf8"
LC_TELEPHONE="ar_SA.utf8"
LC_MEASUREMENT="ar_SA.utf8"
LC_IDENTIFICATION="ar_SA.utf8"
LC_ALL=
[ahmed@ahmed ~]$

[ahmed@ahmed ~]$ cat /usr/bin/firefox | grep -i lang
# implied. See the License for the specific language governing
MOZ_LANGPACKS_DIR="$MOZ_DIST_BIN/langpacks"
## To disable the use of Firefox localization, set MOZ_DISABLE_LANGPACKS=1
# MOZ_DISABLE_LANGPACKS=1
# export MOZ_DISABLE_LANGPACKS
## Automatically installed langpacks are tracked by .fedora-langpack-install
FEDORA_LANGPACK_CONFIG="$MOZ_EXTENSIONS_PROFILE_DIR/.fedora-langpack-install"
# MOZ_DISABLE_LANGPACKS disables language packs completelly
if ! [ $MOZ_DISABLE_LANGPACKS ] || [ $MOZ_DISABLE_LANGPACKS -eq 0 ]; then
# Modify language pack configuration only when firefox is not running 
# and language packs are not disabled
    # Clear already installed langpacks
    if [ -f $FEDORA_LANGPACK_CONFIG ]; then
        rm `cat $FEDORA_LANGPACK_CONFIG` > /dev/null 2>&1
        rm $FEDORA_LANGPACK_CONFIG > /dev/null 2>&1
    CURRENT_LOCALE=${CURRENT_LOCALE:-$LANG}
    # Try to link global langpacks to an extension directory
    if [ -f $MOZ_LANGPACKS_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org/chrome/$SHORTMOZLOCALE.jar ]; then
        if [ -d $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org ]; then
            rmdir "$MOZ_EXTENSIONS_PROFILE_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org" > /dev/null 2>&1
        if ! [ -e $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org ]; then
            ln -s $MOZ_LANGPACKS_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org \
                  $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org
            echo "$MOZ_EXTENSIONS_PROFILE_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org" > $FEDORA_LANGPACK_CONFIG
    elif [ -f $MOZ_LANGPACKS_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org/chrome/$MOZLOCALE.jar ]; then
        if [ -d $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org ]; then
            rmdir "$MOZ_EXTENSIONS_PROFILE_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org" > /dev/null 2>&1
        if ! [ -e $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org ]; then
            ln -s $MOZ_LANGPACKS_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org \
                  $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org
            echo "$MOZ_EXTENSIONS_PROFILE_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org" > $FEDORA_LANGPACK_CONFIG
    if [ -f $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${SHORTMOZLOCALE}@firefox.mozilla.org/chrome/$SHORTMOZLOCALE.jar ]; then
        if [ -f $MOZ_EXTENSIONS_PROFILE_DIR/langpack-${MOZLOCALE}@firefox.mozilla.org/chrome/$MOZLOCALE.jar ]; then
[ahmed@ahmed ~]$

 LANG=ar_SA.UTF-8 firefox

[ahmed@ahmed ~]$ /home/$USERNAME/.mozilla
bash: /home/ahmed/.mozilla: is a directory
[ahmed@ahmed ~]$