Fix: assign author when import mass module
Merge branch 'fix_bugs_from_aminh' of https://github.com/voer-platform/vpw

# By Luong Trieu
# Via Luong Trieu (2) and luongtd (1)
* 'fix_bugs_from_aminh' of https://github.com/voer-platform/vpw:
  show message when add material success
  fixbug
  new features: remove avatar
  fixbug
  convert to new UI

Conflicts:
	vpw/views.py
Fix: publish material without metadata