Save warning confirm dialogs: avoid Yes/No buttons
Yes/No buttons in dialogs are discouraged (not only) by KDE HIG in favour of actions terms.
Elsewhere in Okular instead of the plain "Continue"/"Cancel" buttons more explicit "Continue Reloading" & "Abort Reloading" as well as "Continue Closing" & "Abort Closing" are used. I guess things might want to be aligned here in wordings as another step.
IMHO for now moving away from Yes/No is a first improvement though, so something to be done for now in any case.