Fix translation of roomlist message preview

This also makes long messages unreadable, because we don't shorten long
usernames anymore. We may eventually want to do that again, but it is
hard with translations and we probably want to shorten the displayname
more, as before this change the message was only ever as long as the
timestamp, which is usually just 5 characters...

src/Utils.cpp

@@ -146,11 +146,6 @@ utils::getMessageDescription(const TimelineEvent &event,
                 const auto ts       = QDateTime::fromMSecsSinceEpoch(msg.origin_server_ts);
 
                 DescInfo info;
-                if (sender == localUser)
-                        info.username = QCoreApplication::translate("utils", "You");
-                else
-                        info.username = username;
-
                 info.userid    = sender;
                 info.body      = QString(" %1").arg(messageDescription<Encrypted>());
                 info.timestamp = utils::descriptiveTime(ts);