As user I would like to have a consistent design when using activities portlet

• Type: Story
• Status: Backlog
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Social Networking, Social Networking > Activities
• Labels: None
• Git Pull Request: https://github.com/sergiogonzalez/liferay-portal/pull/3004

Activities portlet has not been lexiconified.

We should apply a basic style redesign to make it similar to other portlets