Last modified: 2012-11-29 13:23:54 UTC
It seems like there's nothing to translate in the message wikibase-propertyedittool-counter-pending-pendingsubpart in repo/Wikibase.i18n.php. If somebody thinks that it should be customized in some languages, then it should be made optional.
I could imagine the "+" can be "translated" into another language. I don't know how often that should be the case. In any case, the message is marked as optional now in the translatewiki.net config per Gerrit change #21037.