feat: use crowdin branches

[vhashimotoo]

Fixes #1674

[molant]

Thanks @vhashimotoo!
I was hoping to switch to the GitHub integration instead of GitHub actions to reduce some of the code, but I'm having some problems with my tests so probably better stick to what we know is working 😊

Are you planning on moving the translations of each matching branch to /content/?

[vhashimotoo]

Are you planning on moving the translations of each matching branch to /content/?

I expect Crowdin to automatically do this

[molant]

I expect Crowdin to automatically do this

I didn't get the feeling they'd modify paths of the content when I talked to them about versioning a couple months back 🤔. Did you find something in the documentation that made you think that? I can probably pinged them to clarify if needed.