message: Fix group Leave button tooltip
diff: @@ -787,8 +787,8 @@ export default React.createClass({
  </div>;
  } else if (group.myMembership === 'join' && this.state.editing) {
  const leaveButtonTooltip = this.state.isUserPrivileged ?
  - _t("You are a member of this community") :
  - _t("You are an administrator of this community");
  + _t("You are an administrator of this community") :
  + _t("You are a member of this community");
  const leaveButtonClasses = classnames({
  "mx_RoomHeader_textButton": true,
  "mx_GroupView_textButton": true,
  