Add Usenix.org translator

[timlst]

Conference hosted on usenix.org include BibTex style syntax for capitalization in their page metadata.
E.g. this paper includes 5 brackets within the title

• PR adds a simple translator which removes brace pairs from title field
• tries to account for escaped braces intended in the title, but could not find an example

[alex-ter]

I wonder if the whole new translator is meaningful here. It seems to me it should rather be an edit for the Embedded Metadata translator directly. Maybe even a general utility "cleanup" function (or an update to the existing one)?

There's a set of smaller things I'd note, but let's maybe first see what maintainers think of the general idea here.

[timlst]

Totally agree, this is a somewhat quick&dirty solution for myself, that I just happened to PR because it annoyed me - my JS was barely enough for this, I didn't want to touch anything bigger

[AbeJellinek]

I actually think this should be its own translator. We don't tend to add fixes to EM for individual sites. If a specific site needs a metadata fix, we wrap EM with a new translator. It's a bit annoying, but it's probably better than crowding EM with tons of tiny edge-case fixes. (I don't know of any other sites that need this fix, at least off the top of my head.)

[AbeJellinek]

Thanks! I guess USENIX doesn't like requests from our CI, but this looks good.

[alex-ter]

Thanks for elaborating, Abe, good to know. I was looking at it as a more generic "cleanup" functionality that could be helpful for other sites, but indeed if that's the only one, having a dedicated translator makes sense to me.