SOC-2351: User Activity Stream UI refinements
What is the problem to fix?
UI refinements for the User activity stream.
- Insert a title "Share My Status" on top
- "What are you working on?" should use a larger font and the box should be a little taller 
- Add : Link | File should be aligned with "Share" button
- Insert a title bar : "My Activity Stream" above the stream tabs
- Rename tabs : All Updates | My Connections | My Spaces | My Status

Problem analysis
Some problems about UI on User Activity Stream is not good experience, so need to refine.

How is the problem fixed?
Apply changes on UI follow comments mainly point to make it better on user experience and make it more properly on labels.
