Add localisations

[Owlet7]

Translate language.csv to all the languages that GZDoom supports.

• Czech
• Danish
• German
• Spanish Castilian
• Spanish Latin American
• Esperanto
• Finnish
• French
• Hungarian
• Italian
• Japanese
• Korean
• Dutch
• Norwegian
• Polish
• Portuguese
• Portuguese Brazilian
• Romanian
• Russian
• Serbian
• Turkish

[maverick-hunter]

I'm translating it to pt-br. Probably will take a couple days, though.