Spark should show who has changed room's topic
Currently if Spark user has changed the topic of a room, it only shows "The subject has been changed to tatata." in the chat window, while other clients show who has changed the topic (e.g. Exodus is using /me command to show that). It would be useful to have that message saying "The subject has been changed by User to tatata." or "User has changed the subject to tatata."