fix announcement title from breaking it's parent container
fix announcement title from breaking it's parent container

Fixes: CNVS-28160

test plan:
- as a user - create an announcement that has a long title
- on the announcment page - the content should not break the
  container old (http://screencast.com/t/iJRnG6ebRjk4)
  new (http://screencast.com/t/7yzaAle0ww)

Change-Id: I8ce421d0254ccf9c65759c25c93516f9a3501190
Reviewed-on: https://gerrit.instructure.com/74969
Tested-by: Jenkins
Reviewed-by: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>
Product-Review: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>
QA-Review: Myller de Araujo <e5c7c5e1b7f2ce5e9870cc98ec52b20b3006cb48@instructure.com>

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