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

[Elvis Angelaccio]

elvisangelaccio accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R318 Dolphin

BRANCH
  arcpatch-D20471

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

To: felixernst, #dolphin, elvisangelaccio
Cc: broulik, elvisangelaccio, yurchor, kfm-devel, fprice, fbampaloukas, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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