Updates the menuGroup.mustache and ToggleListItem.mustache
templates to include the IconLegacy.mustache template partial.
These templates are used by the main menu and dropdown menus
(logged-in user menu and advanced mobile contributions 'more' menu).
This should result in no visual or HTML changes.
Bug: T342908
Change-Id: Idfad10b48c9ee9e833509e3c4063c6a4b014a31b
While dropping support of smart logout in favour of core ready.js
logout, we noticed that the logout selector is a little bit too weak.
Editors could make a link on a page that would work as a logout
button. The easiest way to prevent this (and any other possible
problems) is to add `data-mw="interface"` attribute to all generated
menu entries.
Change-Id: I22611b9641d82328623beb3f693bf7cddb2289ff
