This package seems to be using debconf templates, but some descriptions are not translatable. You should prepend an underscore before every translatable field, as described in po-debconf(7). This may mean that translators weren't properly warned about new strings.
Translators may be notified of changes using podebconf-report-po, for example:
podebconf-report-po --call --withtranslators --deadline="+10 days" \ --languageteam
If the field is not intended for users to see, ensure the first line of the description contains "for internal use".