Please make it possible to modify the reference line tooltip.
Better formatting as suggested here
Locale language (currently only English)
Optionally turned off
--> Community Manager update: see comment courtesy of Thomas Nhan on Feb 21 2019
"This idea has been changed to 'Panned' and it should be available soon in the beta release of 2019.2"
To try out the Beta version, check out the Pre-Release site here: Tableau Pre-Release Programs | Tableau Software