Fix #476 Auto language changing function finished.

Fixes issue#476.
If the user does not have the freeseer.conf file, the function will detect the system location for default language.
If there is a config file, the language setting in that file will have higher priority.
For Chinese, If the location is not zh_CN, Traditional Chinese will be used.
If there is no translation for the system location, English will be used.
Shouldn't this be splitting on underscore `_`, not dash `-`? E.g. `tr_en_US`

I'm guessing the build on Travis is old since it didn't fail.