Use system language

[JakobDev]

Currently puNES uses English as Language when started. If the User wants to use another language, he needs to go to settings and change it. It would be better, if puNES would use the System language. Just add another "Use system language" option to the language box. When selected (this is the default when puNES is started), it will use the language of the System. If puNES is not available in that Language, it should use English.

[punesemu]

Great suggestion. I will but in version 0.111.