Hi Oleg/team
Very excited about your plugin, but I have the same problem as OP, just with a different language.
Some settings can be changed, but the chat message field says 'Type your message...' which I'd like to translate. How is this done?
Similarly, when I type, it shows for the client '[name] is typing'.
I have tried using the plugin 'Loco translate' which usually can do these things, but apparently not with your plugin.