Improve display of queries landing page for totals and no-grouping.
This is currently displaying
From page User:Jean-Frédéric/Red_Pandas, P21, GROUP_MAPPING.TOTALS
From page User:Jean-Frédéric/Red_Pandas, P21, GROUP_MAPPING.NO_GROUPING
with broken hyperlinks.
Also add unit-tests for each use case.
The handling of the Enums in these tests is really not nice
(basically ignoring their nature, and using a fake string).