Unify name for the "window menu" and its button
This MR unifies the user-visible name for what I've called the "window menu", and its associated button. This is the button that is by default in the top-left of a window with the application's icon, and that shows the menu with Maximize, Minimize, Close etc. when clicked.
At least at some point in the past, this was simply called the "Menu button" and that text was still in use in some places. More recently the name for the button (shown in the tooltip and in the Titlebar Buttons KCM) was changed to "More actions for this window". The keyboard shortcuts KCM called it "Window Operations Menu". The window behavior KCM called it the "Actions Menu".
I'm hoping that "window menu" is OK to use throughout. I considered unifying on "window actions menu", or on "window operations menu" button, but thought that just calling it the "window menu" was sufficient.
The tooltip "More actions for this window" when hovering over the window menu button comes from kdecoration, not from kwin, so if this MR is accepted I'll open an MR there too.
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CC: @teams/usability