Hi, thanks for your effort on this work firstly!
I'm a Chinese guy and I want to do such translation to Chinese. According to your post, I translate a .string file and package it to have a first see. However, although I can install my package and switch to my custom language, but my translation (in Chinese) can't display well. It shows □□□□ instead of Chinese words.
Is there any config file that need to be done? Hope for your help.