--- Comment #1 from V Stuart Foote <[hidden email]> ---
The actual gtk widget used is "discard"  and its .UI labeling here of
"_Don't Save" is translatable for l10n needs.
While "_Discard" would be equally acceptable label, no compelling reason to
change from the "_Don't Save" nor to adjust the accelerator for "en" locales.
The other place where "_Discard" is used is in the Document Recovery dialog,
but where the label and accelerator is _Discard, but the gtk widget is actually
to "cancel" the recovery. Its use is also translatable for l10n.
So, IMHO here => NAB and WF -- the effort is up to the dev that writes the core
en-US source and then the respective translators working l10n.