Application Command Localizations

[mrsrmn]

Summary

This PR is an implementation of Application Command Localization

Checklist

• I have run nox and all the pipelines have passed.
• I have made unittests according to the code I have added/modified/deleted.

[thesadru]

I think a few changes are needed.

[davfsa]

Thank you for taking a go at this.

There are quite a lot of little things that need fixing. Probably should run black after you are done too :)

[FasterSpeeding]

Btw its worth noting that, despite the fact the docs don't mention this anywhere, this is actually an unreleased feature that they only documented for a public build-override based beta and therefore might not be merged for a bit (unless @davfsa is ok with merging a public beta but they did a public beta for threads and then made breaking changes 3 months down the line so public beta for discord doesn't guarantee that they won't break stuff).

Also fun fact the build override for this has been broken by command search v2.

[davfsa]

LGTM. Just going to leave this open until Discord roll out localization support, mostly because atm it will break android apps (before some version) if used