D20471: Add "What's This?" to nearly everything in the main window

[Méven Car]

meven added a reviewer: Dolphin.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D20471

To: felixernst, #dolphin
Cc: kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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