[config, i18n] Create default translation mechanism for all supported languages. Mostly usefull in test where language are never initialised from .po files. This is a reapplication of changeset 1a423eaee782 backouted by b9ffecd0316a with an additional fix not to break i18nxxx commands

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#!/usr/bin/env python

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from cubicweb.cwctl import run

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import sys

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run(sys.argv[1:])