D28190: fix: more clear message for the undosend event

[Laurent Montel]

mlaurent requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R206 KMail

REVISION DETAIL
  https://phabricator.kde.org/D28190

To: ltoscano, mlaurent
Cc: mlaurent, kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, knauss, dvratil
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