Bitcoin magnet link

Create magnet link for bitcoin donations and test the link href.
Since you added "Donate" which is an English term, this needs to be translatable. Also since you just removed the inline styling without replacement, makes me wonder if you actually looked at the styling. And I don't think we can expect everybody to have setup the bitcoin: link handler, so providing an easy way to copy paste would seem like a good idea. Finally please stop ignoring my notice about rebasing your changes into single commit, 10 commits for a 5 line change is beyond bearable.