feat: cc_lang setting

[timmycelle]

Added a dropdown setting in the audio settings for changing the caption language.

List of languages added:

• English
• Spanish
• French
• Italian
• German
• Greek
• Korean
• Simplified Chinese
• Traditional Chinese
• Russian
• Thai
• Japanese
• Portuguese
• Brazilian
• Polish
• Danish
• Dutch
• Finnish
• Norwegian
• Swedish
• Czech
• Hungarian
• Romanian
• Bulgarian
• Turkish
• Arabic
• Ukranian

Based on the languages for Panorama_Lang in panorama_english.txt.

[iamsirenstorm]

Ideally we should not have a language in the list unless we have proper support for the base Portal 2 captions translated, but we still do not have a way to verify community translations yet (we still intend on having a system, though!)

I am not going to close this PR, but it's likely going to stay open for a little bit until we have our first non-English language put in the game. What I'm likely to do is ask for the unsupported languages to be commented out when we get around to it. Since it seems like the community is eager to contribute translations, I'll see if we can speed up getting a system in place internally.

This is also sort of delicate as addons could provide their custom captions that supports a language that the base game does not have, therefore the option won't be there. Not sure what to really do in this case.