As an editor I want to be able to add and edit references in order to provide correct provenance for my data.
Editing references in the Bridge directly is difficult in the first step because it requires editing of datatypes we don't support yet - especially Item links. We however still need to provide people with a way to add and edit references. We solve this in Step 1 by giving them a way to go to Wikidata to do it there.
GIVEN an existing statement
WHEN editing it in the Bridge
THEN a link is shown that lets me add and edit references on the repository
[ ] link to repository is shown near references
[ ] link is shown regardless of and how many references exist
[ ] link leads to statement group that is being edited with anchor (same URL as the edit link, just like for bail-out, preserving additional parameters like `uselang`)
[ ] link opens in new tab when left-clicked