Bind the domain represented by app_name to the locale directory locale_dir.
    It has the effect of loading translations, enabling applications for different
    languages.

    app_name:
        a domain to look for translations, typically the name of an application.

    locale_dir:
        a directory with locales like locale_dir/lang_isocode/LC_MESSAGES/app_name.mo
        If omitted or None, then the current binding for app_name is used.

def bindtextdomain(app_name, locale_dir=None):
    """
    Bind the domain represented by app_name to the locale directory locale_dir.
    It has the effect of loading translations, enabling applications for different
    languages.

    app_name:
        a domain to look for translations, typically the name of an application.

    locale_dir:
        a directory with locales like locale_dir/lang_isocode/LC_MESSAGES/app_name.mo
        If omitted or None, then the current binding for app_name is used.
    """

    import locale
    from locale import gettext as _

    log.info("Local binding for app '%s', local dir: %s", app_name, locale_dir)

    locale.bindtextdomain(app_name, locale_dir)
    locale.textdomain(app_name)