def build_subtitle_pages(video_id, language_list):
    """
    Url builder for the json subtitles page for TED talks.
    Building it from the video specific Id and the language
    we want the subtitles in.
    """

    for language in language_list:
        page = 'http://www.ted.com/talks/subtitles/id/{}/lang/{}' \
            .format(video_id, language['languageCode'])
        language['link'] = page

    return language_list