[[https://www.mediawiki.org/wiki/Help:Extension:Kartographer#<maplink> | <maplink>]] is way more user-friendly than the current link to GeoHack. If it's possible, <mapframe> would be even more nice. The AuthorityControl gadget or Wikibase source code should be adjusted to use this feature or some seperate gadget should be created.
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#patch-for-review:
- [x] [valueview: always re-render](https://gerrit.wikimedia.org/r/433890)
- [x] [Wikibase: use Kartographer](https://gerrit.wikimedia.org/r/434177)
- [x] [Wikibase: add `SnakFormat`](https://gerrit.wikimedia.org/r/472061)
- [x] [Wikibase: add verbose preview format](https://gerrit.wikimedia.org/r/472062)
- [x] [WikibaseLexeme: use `SnakFormat`](https://gerrit.wikimedia.org/r/472674)
- [x] [Kartographer: add function](https://gerrit.wikimedia.org/r/472793)
- [x] [Wikibase: use function](https://gerrit.wikimedia.org/r/472794)
- [x] [Wikibase: bump valueview version](https://gerrit.wikimedia.org/r/474665)
- [ ] [Wikibase: update comment](https://gerrit.wikimedia.org/r/476143)