sidebar: Align sidebar item with edge (ltr: left!right)
sidebar: Align sidebar item with edge (ltr: left!right)

This is undoubtedly something we'll want to change in the future, however
other HIG3 compliant applications also justify the text to one edge, so
the library will also need to comply.

ikeydoherty/gnome-app-templates,ikeydoherty/gnome-app-templates