Fix tags in non-english languages and firefox caching selected options

[SahAssar]

This fixes two issues:

1. Bolt saw the slug and the name of a tag as always equivalent, this makes them distinct
2. Firefox has a "feature" where it ignores selected if a different option has been selected before reload and the reload is not "hard". Since select2 takes over the actual input it didn't see the select as changed, so adding a tag and reloading would make it seem like the tag wasn't added, and then a subsequent save would remove the tag.

Fixes: #7659

[bobdenotter]

adding a tag and reloading would make it seem like the tag wasn't added, and then a subsequent save would remove the tag

I've always seen this as a "unfortunate fact of life", but i'm happy to have a fix for it! 👍

[bobdenotter]

There's one failure, on PHP 7.2 only, that says:

It's peculiar though, because I don't readily see how this change could cause that as a side effect.. 🤔

[bobdenotter]

Still the same weird failure on 7.2 only.. I guess you don't see how this could be caused by your changes either, right?

[SahAssar]

Nope, no idea... I'll try too find out.

[SahAssar]

I can't find why my changes would lead to that failure...