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.
I am not sure if one should use this information in citation for the "cited according to" part (at least in theorie), because it might be a second-hand quote (=Sekundärzitat), e.g.
<blockquote>
Daniel Jipp: Zum Folgenbeseitigungsanspruch bei Buchveröffentlichungen - Der Rückrufanspruch. AfP 2014, 300 (cited according to LSK 2014, 350537).
</blockquote>