Add new translator for Bundesgesetzblatt (Federal Law Gazette of Germany...

...)

 * It should be freely available online. Can you access it outside from Germany (see test cases)?
 * I would like to attach the pdf directly to the entry, but it didn't suceed so far (iframe, embedded pdf, ...)
 * The icon seems sometimes not to update. It might just be a dom change and not a real new page load. What was the trick here again?
 * AFAIK the end page is not available.
 * Any other comments?
Yes, this should be again the permalink. There is a function on the page for the permalink "Linkadresse", but I didn't manage to read the value of that input field. Anyway, it is easy enough to create with the different parts.

For example the `url` passed:

http://www.bgbl.de/banzxaver/bgbl/start.xav?startbk=Bundesanzeiger_BGBl#__bgbl__%2F%2F*[%40attr_id%3D%27bgbl114s1620.pdf%27]__1414433589340

and next time

http://www.bgbl.de/banzxaver/bgbl/start.xav?startbk=Bundesanzeiger_BGBl#__bgbl__%2F%2F*[%40attr_id%3D%27bgbl114s1620.pdf%27]__1414433879592