German Documentation file displays incorrect CUPS version

[tillkamppeter]

Reported to Ubuntu as
https://bugs.launchpad.net/bugs/1695876
Original report:
The /doc/de/index.html.in file in the package source has an incorrect
version number written into a header instead of using '@CUPS_VERSION@'
to populate this file as in the other languages' version of the same
file, seemingly resulting in /usr/share/cups/doc-root/de/index.html
having the wrong version once CUPS is installed:

... <div class="body"> <div class="row"> <h1>CUPS 2.0.2</h1> ...

instead of:

... <div class="body"> <div class="row"> <h1>CUPS @CUPS_VERSION@</h1> ...

resulting in 'CUPS 2.0.2' instead of 2.1.3 being shown.

[michaelrsweet]

This isn't the case in CUPS master - the German template appears to have been fixed in April of 2016 so it likely was fixed in 2.1.4...