D16751: Various grammar and capitalization fixes for UI consistency

[Samuel Noordhuis]

snoordhuis added a reviewer: Localization.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D16751

To: snoordhuis, #vdg, #localization
Cc: kde-frameworks-devel, michaelh, ngraham, bruns