For the first part, you’ll need to change the ‘profile’ language file. Follow the instructions in the bottom section here and change the ‘user_x’ value from 'User ^' to just '^'
For the second part - unfortunately there’s nothing you can do. That part is not in your title and Google decided to add the overall site name in there. You can’t get them to change it.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
July 15, 2020: Q2A 1.8.5 released!