Add new translator semantics Visual Library.js

Works for:
 * BLLDB = BLL = Bibliography of Linguistic Literature = Bibliographie Linguistischer Literatur
 * BDSL = Bibliographie der deutschen Sprach- und Literaturwissenschaft
Merge pull request #821 from zuphilip/biblio-semantics
Add new translator Semantics Online Bibliographies.js
[semantics Visual Library] Minor changes. Update tests and defer all
The change to English from German in tests is out of our control, because the website appears to always redirect to English when vid is expired.
Testing depends on aurimasv/zotero@08c3effe6edd87124f917799c8c104a39175dabc Test updating depends on zotero/scaffold@b15c6abc5fa6a94cebf18168b0c43bcf9c66401e
CC @zuphilip