feat(helper): missing key finding web page

[Taelar]

When working on the fr-fr localization, I found it hard to keep track of missing keys in the translation file. As a web developer, I figured I could build something to help myself and other contributors working on translations.
So here is my proposal for a web page that lists missing keys in localization files, based on keys found in the en-us.xml file. Since it runs in a browser page, it does not require any developper tool like Python or Node. All the works is made client side as there is no server.
I tried to make it as low-maintenance as possible:

• Uses the File System Access API to automatically list available translation files (no need to hardcode filenames)
• Generic XML parsing that should handle format changes
• Everything in a single HTML file

As mentionned in the README.md, this uses the File System Access API, which currently works on Chrome, Edge, and Opera. Firefox and Safari don't support it (yet?).

I've provided screenshots and demo video to make sure everyone understands how it works.

I also understand that my proposal is a bit sudden, and involves security concerns. If you are uncomfortable with anything, I would be happy to discuss it and make appropriate changes.
I'm also available on the HunterPie Discord (DM open).

Thank you hunters.

[haato3o]

That's a pretty cool idea!