Add sbs:dtbook-to-pef script (simple pipe of dtbook-to-zedai and sbs:zedai-to-pef)

and rename bundle 'dtbook-to-pef'
Make compatible with newest version of braille modules
Add German implementation of org.daisy.braille.table.TableProvider
Improve translation:

* Better CSS
* Add boilerplate text
* Generate table of content
* Handle footnotes
* ...
Add hyphenation (libhyphen)