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Update French translation

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Introducing a new Plugin type: CLI

Now plugins can create their own command line interfaces. They are
executed through a single entry point in bin/plugin.php

Support for configurable e-mail return path

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fix: correctly show conflicts in extension manager

fix: check if key is set to fix PHP Notice

If a key is not set, a PHP Notice is triggered. While these are
currently suppressed, this is still a code smell.

fix(config): empty string is valid for numericopt

There was a bug that the empty string was considered to be invalid if
also a max or min value was defined for a config field of type
numericopt.