Get rid of GettingStarted tabs in empty

I feel that we should keep empty.html’s GettingStarted very simple, and
link to other places for tutorial material
Move the title display into a macro so that it can be overridden
Extension of the idea of 5b38c21a417d2e5e2b85aed8010c88af32420e24
Merge pull request #1221 from xcazin/timeline

Move the title display into a macro so that it can be globally overridden
Updated translations for Danish

Thanks to Birthe C
Merge remote-tracking branch 'upstream/master' into fred
Remove dependency on core timeline macro by overriding timeline-title() instead

In application of #1221