Merge branch 'feat-user-groups' into 'master'

app/create/templates/create_experiment.html

app/create/views.py

app/experiment/templates/view_experiment.html

app/experiment/views.py

app/models.py

app/routes.py

app/static/css/main.css

app/static/css/style.css

app/templates/home.html

app/templates/index.html

app/translations/el/LC_MESSAGES/messages.mo

app/translations/el/LC_MESSAGES/messages.po

app/translations/fa/LC_MESSAGES/messages.mo

app/translations/fa/LC_MESSAGES/messages.po

app/translations/fi/LC_MESSAGES/messages.mo

app/translations/fi/LC_MESSAGES/messages.po

app/translations/it/LC_MESSAGES/messages.mo

app/translations/it/LC_MESSAGES/messages.po

app/translations/zh/LC_MESSAGES/messages.mo

app/translations/zh/LC_MESSAGES/messages.po