Review english texts

To review it, just go through the english .po translation files:

1. locale/en/LC_MESSAGES/djangojs.po
2. locale/en/LC_MESSAGES/django.po

To change some text, look at the .po header to figure out where that translation is then:

1. Change it inside its original file
2. Create the new messages files using python manage.py makemessages --all
3. Compile it python manage.py compilemessages