Implement automatic translation updates

[msujew]

What it does

Closes #10885

Runs the theia nls-extract and theia nls-localize workflow on every PR to create a commit that automatically translates all added content.

How to test

1. This PR should contain an automatically generated commit named Automatic translation update
2. The commit adds any missing values to the nls.json and localizes them automatically into different languages

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[colin-grant-work]

I don't know any Czech, but this differs quite substantially from the corresponding VSCode translation:

Might it be possible to do a nls.json update so that we can use checked translations where available before we implement this?

[msujew]

We wouldn't do the nls.metadata.json update in this repo (as that would break translation in an unexpected fashion), but probably somewhere else where we can simply download the file from. I generally agree with your idea and we can likely implement this in the translation-update.js script. However, would it be alright with you to tackle this in a separate PR/issue? I believe it'd be quite a lot of work and a bit outside of the scope of this PR.

[msujew]

I created an issue here: #11443

[colin-grant-work]

Sounds reasonable 👍

[colin-grant-work]

I have some misgivings about the quality of the automatic translations, but this PR appears to accomplish its goals.