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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def init():
 """ Install gettext with the default parameters """

    if "_" not in builtins.__dict__:  # avoid installing lang two times
        os.environ["LANGUAGE"] = inginious.input.get_lang()
        if inginious.DEBUG:
            gettext.install("messages", get_lang_dir_path())
        else:
            gettext.install("messages", get_lang_dir_path())