D23415: Improve comprehensibility and consistency of window placement mode names

ngraham added a comment.


  In fact, the HIG already says that:
  
  > https://hig.kde.org/style/writing/labels.html#guidelines
  >  Don’t shorten your labels to the point of losing meaning. A three-word label that provides clear information is better than a one-word label that is ambiguous or vague. Try to find the fewest possible words to satisfactorily convey the meaning of your label.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23415

To: ngraham, #kwin, #vdg, ndavis, filipf, zzag
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