def clean_translation(translation):
    """Clean the translation string from unwanted substrings."""
    illegal_substrings = ['; french.languagedaily.com',
                          ';\u00a0french.languagedaily.com',
                          ' french.languagedaily.co']
    for iss in illegal_substrings:
        translation = translation.replace(iss, '')
    return translation