Before you create a release, branch it off of master. The name should be "$MAJOR.$MINOR" or similar, i.e. "1.2". This branch will be called "stable branch" in the text below. Push the branch to the remote repository.

git branch -b 1.2
git push --set-upstream origin 1.2
You can also branch after making a tar using releaseme's branchme.rb script

Whenever you make a new stable branch you must e-mail kde-i18n-doc to ask for translations to also be branched and repo-metadata to be updated.