Add Team Description to the Team Settings (#4652)

* draft

* Add Team Description to the Team Settings

* add tooltips for team description

* made changes per PM review

* add message when there is no description set in the team

* squash

webapp/utils/constants.jsx

@@ -829,6 +829,7 @@ export const Constants = {
     DEFAULT_MAX_CHANNELS_PER_TEAM: 2000,
     DEFAULT_MAX_NOTIFICATIONS_PER_CHANNEL: 1000,
     MAX_TEAMNAME_LENGTH: 15,
+    MAX_TEAMDESCRIPTION_LENGTH: 50,
     MIN_USERNAME_LENGTH: 3,
     MAX_USERNAME_LENGTH: 22,
     MAX_NICKNAME_LENGTH: 22,