The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The short description of a select, multiselect, string and password debconf template is a prompt and not a title. Avoid question style prompts ("IP Address?") in favour of "opened" prompts ("IP address:"). The use of colons is recommended.
If this template is only used internally by the package and not displayed to the user, put "for internal use" in the short description.
Please refer to Debian Developer's Reference section 22.214.171.124 for details.