I suspect it's because they have no one to do the localization. The dev team is all European and none of them speak either language enough to do the translations themselves.
I'm pretty sure a lot of the localization translation work has been done by the player community along with the developers. If you feel changes are in order and are capable of doing them accurately then I'm sure they would be grateful for the help.
What I care about most is the tutorial and mission,many player lost their interest because of the poor translation of tutorial
The simple reason: We had/have volunteers for these languages, but currently they are not available anymore. For PDA stuff that is more complicated: As these are BIG chunks of text that gets changed with every other version update, we currently want to wait until this is really set in stone. Translating a book for weeks and then having to throw it away because the topic changed a week later would be frustrating, no? Other then that: if you want to volunteer, send me a mail (must be ok to use with Google Services)
I have talked to Talyen that my friend will offer help and he is a knowledged translator.I believe he will not give up halfway
If you want any loca officially in the game, you/he would need to talk to me first (As we cannot use sent-in loca files, but need to work on the loca itself via GoogleDoc as a helper)