chore: Translate djangojs.po in el

92% of minimum 50% translated source file: 'djangojs.po'
on 'el'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/edx-platform/conf/locale/el/LC_MESSAGES/djangojs.po

@@ -829,7 +829,7 @@ msgstr "Οι ρυθμίσεις ενημερώθηκαν"
 #: cms/static/js/views/course_video_settings.js:494
 #: cms/templates/js/course-video-settings-update-settings-footer.underscore:11
 msgid "Last updated"
-msgstr ""
+msgstr "Τελευταία ενημέρωση"
 
 #: cms/static/js/views/course_video_settings.js:557
 msgid "Required"