Add new translator Semantics Online Bibliographies.js

This translator can handle two websites:
 * BLLDB = online version of the  Bibliography of Linguistic Literature (BLL)
 * BDSL = online version of the Bibliographie der deutschen Sprach- und Literaturwissenschaft

see #811, which are avaialable in German and English.

Some remarks:
 * The test cases are only working if you replace the `vid` parameter with a current session key.
 * I feel that all information from the classification and so on are just too much to add everything as tags. Moreover, I have no idea how to restrict to not more than 10 good tags. Thus, I don't add any tags, but everything should be searchable in the snapshot.
Can you add some words about the priority for other translator types on that wiki page? Is it useful for import, export, or search translator?