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.
Saving the tags is a good idea. 
However, I do not see any use case where I would need the LSK number. I don't oppose saving it though