Fixing date range of date from in stream page.

Earlier possible date is 2005 (beginning of Freesound) and latest one is
today.
Fixing wording in stream page
Only show stream link if the logged user is following users or tags.
Don't show settings for weekly stream emails subscription when user is not following anything.

Improved wording too and a minor code guideline.
Changing wording of social section.
Adding local sass styling to all.css.
Adding link and icon to browse page.
Temporary solution for the follow user link on sound page