Identify and translate missing plural keys

[markedmondson]

From #582

• For locales identified in a call to translate commands, determines the existing and required pluralization keys and adds the nodes to the forest before translating. It will additionally remove unrequired plural translation keys.
• Adds a label to the front of missing plural keys when running the missing command as the table headers were a little unclear.
• Add a --skip-interpolation option to the missing command (but specifically intended for translation) that won't send only interpolated strings to translate, the reasoning behind this was a) I found OpenAI would end up getting a mismatched number of results returned if there were a lot of them and b) it's kind of wasteful as a correctly configured Rails implementation would fallback and work correctly.

I think there's still some cleanup to do here, it feels a little clobbered together as I was learning as I went so totally happy to solicit feedback (or hear and attempt to address any problems).

[glebm]

Rather than adding an option, perhaps we should always simply copy such keys verbatim? There is never a reason to translate them.

[markedmondson]

That would be preferential in our use case but I didn't want to assume...

[markedmondson]

Actually we don't even copy them, we have Rails configured with fallback which then just works... Not sure that's a safe assumption either though.

[glebm]

There is never any reason to pass interpolation-only values through machine translation, so let's copy them verbatim?

[markedmondson]

Sounds good to me! :)

Edit: Although in our case we don't want to copy them either, I'd prefer to skip and leave them to fallback. Should I leave a mechanism in place for that?

[glebm]

Sure, makes sense to have that as an option.

[markedmondson]

TODO: Remove

[markedmondson]

I spent a little more time on this on a large translation (~610 keys in 30 locales) and added a tweak.

Namely, ChatGPT is pretty bad at returning the correct number of responses back, I've added the array size to the prompt but even then it struggles if there are repeated translations - so there's a fail safe that'll retry and then fall back to doing line by line. I also found dropping the default array size from 50 to 25 improved things somewhat.

Edit: Looks like there's a problem with the removal of pluralization keys that aren't required, eg we translate one, other and zero from en.yml, they get copied to ru.yml even though it only needs one, few, many, other because it gets caught and merged in the missing_diff_forest (even though missing_plural_forest removes it).

[markedmondson]

Edit: Looks like there's a problem with the removal of pluralization keys that aren't required, eg we translate one, other and zero from en.yml, they get copied to ru.yml even though it only needs one, few, many, other because it gets caught and merged in the missing_diff_forest (even though missing_plural_forest removes it).

I fixed this in 7e47ded

I think a separate task to remove plurals from locales that are not required would be kinda useful as a distinct thing.