Run tests for tails-weblate-update.hook

I added tests for tails-weblate-update.hook in files/gitolite/hooks/tests. IMO we should run those tests by Jenkins and/or with puppet.

Initially I thought, that we only can run the tests, if the file has a .py suffix. But enrico showed a way to solve this.

Original created by @Hefee on 16712 (Redmine)

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