Update main.c

Add chinese simplified support, but langid is shot format(primary language ID) so chinese is only chinese CHS or CHT.I think is right that uint16_t langid = GetUserDefaultUILanguage() & 0xFFFF; ... case 0x0804: LANG = LANG_CN;
Update main.c

fix language support to full Language Identifier.
Update ui_strings.h

Add a Chinese Traditional Translation.
Update ui_dropdown.h

Add a Chinese Traditional Translation.
Add a Chinese Traditional Translation.

Add a Chinese Traditional Translation.
Add a Chinese Traditional Translation.
Merge branch 'master' of https://github.com/kaisfm/uTox