Implemented conversions between JSON and Xcode files

[Jag-Marcel]

Description

This PR implements python scripts to convert between JSON files and Xcode's .xcstrings string catalogs and adds the current localizations from the iOS app to the existing JSONs.

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[andrewtavis]

Would be great if you'd present this, if you're comfortable 😊

[Jag-Marcel]

Yes, I can present this at the next sync

[Jag-Marcel]

@wkyoshida it looks like the changes here aren't automatically updated in the Scribe-iOS subtree, could you sync them when you have the time?