add author of message

[panivita]

Description

In the list the last conversation in overview page if the message from the current user we will see 'You: ....message text'.

Fixes # (issue)

How to test?

localhost/overview write messages, add rooms and write here messages Please provide a short summary how your changes can be tested?

Checklist

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] This PR is ready to be merged and not breaking any other functionality