Vector: Label the more actions menu "More", not "Actions"

Vector: Label the more actions menu "More", not "Actions"

Vector has a consistent way of showing most actions – as tabs, or, if
there are too many or the action is unimportant, shunting them into an
additional actions menu. This menu was problematically labelled "Actions"
which though correct is misleading as it is merely /some/ actions,
alongside the generally-promoted "Read", "Edit" and "View history". The
recent change I09c8031c makes the label of this menu much more prominent
(as it is no longer hidden), which makes the labelling issue more acute.

This menu could have many labels, and this is merely a suggestion. Some
alternatives:

 – "Tools" — However, this conflicts with the page tools shown in the
   left-hand nav, which although arguably should be moved into this menu
   is an argument for another day, as it would notably alter the skin for
   readers who otherwise don't get this menu at all.

 – "Tasks" — This feels more like a term that would be used for an
   individual, or perhaps for the article itself, to denote a worklist –
   a list of outstanding issues to be ticked off ("Orphaned article";
   "Needs wikifying"; "Copyedit"; etc.) rather than a set of task actions
   you can do as atomic steps to the page.

 – "More actions" — This is rather wordy and ideally should be
   unnecessary in the minds of editors who should (through the consistent
   use of simple verbs as action labels) already recognise each of the
   tab links along the top-right of the navigation to be page-
   specific actions.

Bug: 44591
Change-Id: I8697beab5695198c0acddcf9ad8eeca189660c94