feat(Locale): add localization support

[ShadowApex]

This change adds preliminary locale support so users can play in their preferred language.

Fixes #62

[pastaq]

What's the plan for ensuring localization is maintained as we add features or change things? Can plug-ins ship localization?

[ShadowApex]

What's the plan for ensuring localization is maintained as we add features or change things? Can plug-ins ship localization?

I was thinking that we could use Weblate to get community support in maintaining localization. It will definitely be a challenge at first, but it should become easier as time goes on when there are fewer text changes.

We should be able to support plugin's also shipping localization strings. Godot has a TranslationServer which can be used to dynamically add translations at runtime. To implement this, we should be able to update PluginLoader to look inside the plugin archive for any *.po files and load them using the TranslationServer. I was thinking we could try to do this in a follow-up PR.

[github-actions]

🎉 This PR is included in version 0.30.0 🎉

The release is available on GitHub release

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