Improve team members and repositories settings UI (#5457)

* improve team members and repositories settings UI

* use tab on team pages

* add default description on team members and repos

* add blank on numbers and texts

* improve translation

options/locale/locale_en-US.ini

@@ -1327,6 +1327,8 @@ teams.add_team_repository = Add Team Repository
 teams.remove_repo = Remove
 teams.add_nonexistent_repo = "The repository you're trying to add does not exist; please create it first."
 teams.add_duplicate_users = User is already a team member.
+teams.repos.none = No repositories could be accessed by this team.
+teams.members.none = No members on this team.
 
 [admin]
 dashboard = Dashboard