Add "Update All Models" functionality to bulk edit models

[fhp]

Checklist

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Warnings

• This PR will change existing database contents.
• This PR introduces a breaking change to existing installations.

Summary

This PR enhances the bulk edit functionality by adding an "Update All Models" feature. The new functionality allows moderators to update all filtered models at once, rather than having to select them individually. This is especially useful when updating tags for large collections, or assigning all models with a certain tag to a creator or collection.

Linked issues

Description of changes

• Added "Update All Models" button to bulk edit interface
• Added translations for the new button in multiple languages (en, de, es, fr, pl). Translations were AI generated and translated back, looks ok, but I'm no native speaker.
• Enhanced ModelsController to handle bulk updates for all filtered models
• Add some tests (AI generated, I'm no Ruby developer, but it looked good to me)

[Floppy]

Pretty sure there is a "select all" box at the top, perhaps badly signposted. I'm away from my machine now, will check later on.

[Floppy]

Unless, and I haven't looked to see if this is the case, the idea of this is to update everything in every page? Which you can't currently do, for sure.

[fhp]

update everything in every page

Yes, that is the point :)

I had some tags with 50-200 models in it, that should become collections. Updating that page for page was quite tedious.

And I wanted to remove the !new tag, but didn't even try.