The tooltip of the + button should start with a capital letter

-> "Open chat". That would be the minimal variant of this issue.

At the same time I wonder why the search bar is called "Find or start a conversation" and if it needs some more changes.

My idea: Simply rename the search bar to "Find conversation" and declare the + button as "Start conversation". Because the search field never starts a conversation.

Irritating would be the back button within the conversation view, which currently has the tooltip "Hide chat view". Is it actually spelled "chat view" or "chatview"? And shouldn't it be called "Conversation(s) view" and therefore "Hide conversation"?