Fix school edit pages

Surrounded each translation tag with braces. No longer raises a template rendering error.
Merge pull request #220 from svoigt/master

Fix template rendering error on school edit pages.
Fixed two typos
Merge branch 'master' of github.com:p2pu/lernanta
Allow trusted users to export a list of email addresses for course signups
Merge pull request #221 from ercchy/master

Integrate badges from badges.p2pu.org with courses
merged conflicts
Add support to clone content and courses.
Show course clone button for oranizers
Add signup date to course user export
Merge pull request #222 from dirkcuys/master

Support for cloning courses and exporting course signups
Rename EMBED_API_ENDPOINT to BADGES_OEMBED_URL
Move badges oembed code to separate file
Merge branch 'master' of github.com:p2pu/lernanta
Pin git requirements to avoid surprises
Revert to django-push from paulosman github repo
Pin html5lib requirement
Redirect from the old notification preferences to the new notification preferences.
Update URL for notification preferences
fix indentation for urls