Adding a translator for french union catalog CCFr

As requested in [Zotero Forum](https://forums.zotero.org/discussion/37503) I've built this first version of a translator. 

It still misses somes specific cases but works for > 90% of records I'd say. CCFr catalog is full of JS, not that easy to parse.

Tests are style missing, hope it's not blocking.
In theory that should be a good choice, but "document" actually is missing a lot of metadata fields. Can you make a better guess as to what the item might be. I think "book", "bookSection", "journalArticle" are good candidates. "report" if you really don't like those.