add alternate symlinks for Czech and Turkish

Czech can be accessed through 'cs' (ISO 639 for language)
                           or 'cz' (ISO 3166 for the country).

Turkish can be accessed through 'tr' or 'tr_TR'.

Japanese can and could be accessed only through 'ja' (the conf.py file was
lying).

Signed-off-through: Chris “Kwpolska” Warrick <kwpolska@gmail.com>