In image names in the context menu, use spaces rather than underscores

Change-Id: I69828ea73575eaa34f3416080e3738ef4968b7ad
Followup 54458c8: take directionality for parameter icons from frame, not toolbar

The parameter icons are not toolbar-contextual, so don't style them that way.
Instead, have them take their directionality from the .oo-ui-{ltr,rtl} classes.

Change-Id: Ic94b1e854b36542f7bcde97ead60eddcd56ccbea
Merge "Followup 54458c8: take directionality for parameter icons from frame, not toolbar"
Merge "In image names in the context menu, use spaces rather than underscores"