Typos, wizard appearance and german i18n

As requested, here is the german i18n.

I had to modify the XGETTEXT_OPTIONS because all the translations in <col>-tags were "thrown out" again with every make.

While at it, I also fixed a few minor typos and tried to give the wizard a more uniform look (markup for the notes),

I also tried to make the note about the Webbrowser command entirely visible but enabling the "wrap"-property makes the window inappropriately grow in height (bug in glade?)