The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
This package contains a file named *templates.XX or
*templates.XX_XX. This was the naming convention for the translated
templates merged using debconf-mergetemplate. Since the package is using
po-debconf, these files should be replaced by language-specific files in
debian/po directory and should no longer be needed.