D12130: Use the more user-friendly string "File format" in the open/save dialogs

[Nathaniel Graham]

ngraham edited the summary of this revision.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D12130

To: ngraham, #frameworks, #vdg, bruns, alexeymin, rkflx
Cc: rkflx, alexeymin, abetts, bruns, michaelh, ngraham