Hi Taha,
you can try the "locale" switch in the config.ini file. Following is help on how you can use that

#---------------------------------------------------
# Parameter Name    : locale
# Parameter Type    : OPTIONAL
# Description       : Specify which language the client should open, irrespective of regional settings.
# Parameter Format  : string
# Supported Locale  : en, cs, de, es, fr, hu, it, ja, ko, pl, pt, ru, tr, zh_CN, zh_HK, zh_TW
# Additional Info   : Chinese got 3 flavors and hence it is mandatory to specify country code as above.
#              For other locales, we dont have this distinction. But there is no harm if we specify it that way.
#              For example, en_US and en_GB will fallback to pick en.res bundle.   

#Examples :locale =en, locale=fr, locale=en_US, locale= fr_FR, locale=zh_TW