Here is a patch for the proposed change.
For the record, until LO 3.6 this was the case. Only since 4.0 is the button a simple OK.
(In reply to Gabor Kelemen from comment #1)
> Only since 4.0 is the button a simple OK.
Interesting. Temporally consistent with first entry in git history for printdialog.ui:
# 87b5cdd5 10-Sep-2012
convert writer, draw, impress, calc and starmath printer dialogs
to new-style widget layout mostly described in .ui format
which suggests that "print" became "OK" for an unintended "generic" reason.
Well, I don't see a reason why it shouldn't be "Print".
Seth Chaiklin committed a patch related to this issue.
It has been pushed to "master":
tdf#130517 improve accelerators on Print dialog page
It will be available in 7.0.0.
The patch should be included in the daily builds available at
https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.