Update beck-online.js

1. beck-online.js
Added support for beck-online "Leitsatzkartei" LSK (database of leading records), i.e. scraping of articles where beck-online does not have the article itself but only information about the article

2. juris
Added new translator for the German legal database Juris.
looks like the rest of the code relies on this being in upper case. Let's `.toUpperCase()` it here and get rid of the rest.