i18n-de: update many fuzzy entries and translate some simple ones
I mainly did the simple cases, like removing ".. note::", changing single
quotes to double quotes and adapting underlining.
Unhelpful msgstr in fuzzy entries are removed. (They were suggestions by the
program msgmerge.)
Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:
http://docutils.sourceforge.net/rst.html
It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:
http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.