SOC-4111: [User profile] The field "position" isn't very clear

Fix description: Add word "Your Current position" in user current position if it's not empty.
SOC-4040 Space Activities are visible for everyone

Fix description:
- in setOwnerName method, if the viewer is not the owner of activities stream, then the selected display mode is set as owner status.
Merge commit '0520702ff2c54b31bf212eae6fd3bd2652522abe' into HEAD