Clark You might want to consider switching the language to English, this way I haven't noticed any out of the ordinary issues.
That would probably be a bigger inconvenience than Play Store not updating itself or Play Services, and only some days are able to install and update apps. Some proprietary apps I use are written in a way where they assume the system language is the right one to use.
I'll just set up my phone like it was before the factory default again. Whatever the issue is, a factory default doesn't resolve it, so I have to look for some other kind of solution.