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?
Well, the idea would be that seeing the en-dash the user would be compelled to fill in the rest (e.g. from looking at the PDF). But if the end page is not used in law citations, then nvm.