Some whitespace changes and including the subject of the sentence in the translation string:
```html
                <li><a href="{{url_for('discography', artist_mbid=artist.data['id'] ) }}">{{ _('Discography') }}</a></li>
                <li>{{ _('to do: figure out what subpages we want') }}</li>
                <li><a href="http://musicbrainz.org/artist/{{artist.data['id'] }} ">{{ _('%(artist) on MusicBrainz',
                    artist=artist.data['name'],
                )}}</a></li>
```