Configurator: Change global emulator system language/region

[XargonWan]

Some emulators are setting the games language with the default system language that is now english/europe. We need a Configurator option to orchestrate this change in all the emulators at once so the users can change the language in their games easly.

Emulators that need this:

• [ ] Dolphin (SA) (Global Language, GC Language, Wii Language)
• [ ] Yuzu
• [ ] Ryujinx
• [ ] RPCS3 (Console Language, Console Region)
• [ ] Citra (SA) (Console Region: Auto-select, Interface language)
• [ ] MelonDS (SA) (Frimware Language)
• [ ] to verify: Duckstation
• [ ] CEMU (Console Language)
• [ ] Vita3K (not yet available)
• [ ] MAME (standalone)
• [ ] ⚠️ RetroArch (RetroArch Language but System/Language is per-core)

[Lazorne]

SteamOS 3.5 is doing language changes to how SteamOS works. We wait for those.

[XargonWan]

SteamOS 3.5 is doing language changes to how SteamOS works. We wait for those.

No, actually this concerns only the emulators settings, it's not taken from the OS afaik. My SteamOS is Italian but RPCS3 plays in english until I change it in the options.

[XargonWan]

Critical points:

• Some emulators got a language and a region, should we ask the user both?
• on RetroDECK we should show all the Region/Language even if they're not supported by all the emulators, what are we doing if I choose EU/Italy but for example on CEMU is not available? We just fallback to EU/English for the unsupported systems?