D14641: Refine wording when a folder with an invalid name could not be creted

[Nathaniel Graham]

ngraham edited the test plan for this revision.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D14641

To: ngraham, #dolphin, #frameworks, #vdg, tmarshall
Cc: kde-frameworks-devel, michaelh, ngraham, bruns