add ugettext and fix datadog encode
add ugettext and fix datadog encode

WatanabeYasumasa/edx-platform,yokose-ks/edx-platform,yokose-ks/edx-platform,yokose-ks/edx-platform,WatanabeYasumasa/edx-platform,WatanabeYasumasa/edx-platform,yokose-ks/edx-platform,WatanabeYasumasa/edx-platform,yokose-ks/edx-platform