message: Update copy for DM invites
  Fixes
diff: @@ -451,16 +451,21 @@ module.exports = createReactClass({
  if (isDM) {
  title = _t("Do you want to chat with %(user)s?",
  { user: inviteMember.name });
  + subTitle = [
  + avatar,
  + _t("<userName/> wants to chat", {}, {userName: () => inviterElement}),
  + ];
  + primaryActionLabel = _t("Start chatting");
  } else {
  title = _t("Do you want to join %(roomName)s?",
  { roomName: this._roomName() });
  - }
  subTitle = [
  avatar,
  _t("<userName/> invited you", {}, {userName: () => inviterElement}),
  ];
  -
  primaryActionLabel = _t("Accept");
  + }
  +
  primaryActionHandler = this.props.onJoinClick;
  secondaryActionLabel = _t("Reject");
  secondaryActionHandler = this.props.onRejectClick;
  