Adjust @require_AJAX decorator for New Relic use (#625)
Adjust @require_AJAX decorator for New Relic use (#625)

Without this change, New Relic groups all functions using @require_AJAX
decorator into a single transaction, which makes it impossible to see
how each of them performs. Most if not all AJAX views use this
decorator (17 at the moment).

See:
https://docs.newrelic.com/docs/agents/python-agent/supported-features/python-tips-tricks#decorators_and_introspection
mastizada/pontoon,mathjazz/pontoon,mozilla/pontoon,mastizada/pontoon,mastizada/pontoon,jotes/pontoon,jotes/pontoon,mathjazz/pontoon,mathjazz/pontoon,mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,jotes/pontoon,mozilla/pontoon,mastizada/pontoon,jotes/pontoon,mozilla/pontoon,mathjazz/pontoon