Looking at the source package from Debian experimental, a quick grep shows which translations do not include the special control character:
grep -c $'\x1f' po/*.po | grep ':1$'
Excluding the de_AT and hu locales, which currently aren't translating the above mentioned message, these locales are still affected from the bug:
po/id.po po/it.po po/rw.po po/tr.po
Since these files are not modified in the Debian patches, this is definitely an upstream issue, still present in 4.13.92.
Looking at the source package from Debian experimental, a quick grep shows which translations do not include the special control character:
grep -c $'\x1f' po/*.po | grep ':1$'
Excluding the de_AT and hu locales, which currently aren't translating the above mentioned message, these locales are still affected from the bug:
po/id.po
po/it.po
po/rw.po
po/tr.po
Since these files are not modified in the Debian patches, this is definitely an upstream issue, still present in 4.13.92.