As a template editor, I want to ensure my infobox always displays a quantity using the same unit, no matter which (convertible) unit is used in Wikidata.

Problem:
Wikibase supports unit conversion, but currently only in the RDF export – it’s not available to client wikis.

See T190813: Module for unit conversions for some related discussion.

Example:
Football players’ heights might be given in m or cm (query), but an infobox should always display it the same way.

Screenshots/mockups:

BDD
GIVEN
AND
WHEN
AND
THEN
AND

Acceptance criteria:

Open questions:

• Do we also want to make this available via parser functions?
• Should this be an interface similar to RDF, where you can get the converted value of a certain Wikibase quantity, or a more general unit conversion module that you can also feed your own quantities into?