Juris Translator

(This is based on a previous pull request)
Translator fetches journal articles and cases (new) from Juris

Should have mentioned this earlier. In parallel with the tables for Zotero done by @aurimas, there is [a set of item-type/field tables for MLZ](http://fbennett.github.io/z2csl/diffMap.html), with markup to show additions to the Zotero schema.