Due to the translatewiki problems addressed in [1] we might have translation issues with the text added in [2]. If translatewiki works again we should make sure if that's the case for at least this message.
[1] https://lists.wikimedia.org/pipermail/wikitech-l/2018-September/090864.html
[2] https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/TwoColConflict/+/460022/
Checked the message from the patch linked and also a couple of others that were merged after the incident. They all look fine and translated messages are there.
( e.g. can be checked on https://tools.wmflabs.org/wmde-editconflict-test/core/index.php?title=Spezial:SimulateTwoColEditConflict with changing the language to de and hovering over the "save check-mark" after editing a block