return 0; is best, the compiler will turn it into an exit call.

This being a template, better use a lower number here, like 3.0
Nothing in the template requires that current version 3.10, so no need to be that demanding by default((e.g. KDevelop's code also still only requires 3.0 :) ).

All the translations can be removed.

KDE's automated translation system has a separate database with all the translations, which is filled directly by the translators with translations (actually pp files in a svn repo).
Once per day (actually CET night) a script runs over the sources and pulls all strings which need to be translated, and pushes back translations that are stored in-source like in this kdevtemplate file. And anything which is not in the database will be removed.

So once this is in, and due to the original strings not yet extracted into the database and thus no translations existing, all the translations here will be removed on the first run of the script. So no need to have them here from the start.

Just keep the
'''
Name=CMake C
'''
line.

Same as for Name translations. Just keep the

Comment=Simple CMake-based C application

line.

This goes down to personal preference, discussing this is trivial so I'll comply. That excludes the need for stdlib.h but I am keeping it for the sake of convenience.