Use independent template for lqt archive page

Adds a new i18n key flow-importer-lqt-converted-archive-template
and uses it as the template dropped on the archived LQT page after
conversion is completed.

Change-Id: Ie286fbab497046a5b1bf44659fa4a85d2db79295
(cherry picked from commit ca8267e66a83d8e25866f428c33acc74e45315db)