Juris Translator

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

Side note: Work on the German paper has convinced me that it's time to start working on modularity in the legal styles. It will probably mean casting a separate CSL schema for the legal modules. Then existing code can be adapted to the schema, and the CSL-m styles can be adjusted to pick up the code from there. I'll start on that after the code for the current paper project is out of the way.