D16050: Added missing QStringLiteral to Dolphin code

[Nathaniel Graham]

ngraham added a reviewer: Dolphin.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D16050

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