Extend User personal information
1) ADD new fields
- first name
- last name
- sex
- handedness
- birthday
- phone
- about me
- city
- street
- post code
2) EDIT enhance user profile
- cleaner design
- default avatar image based on gender if no provided
3) ADD UserHelper
- labelize_user_role
- labelize_user_old
4) EDIT small template modifications
- labelized user roles in profile popup dialog
- default avatar in popup and left sidebar if no provided
5) ADD Rails Czech translation file