I can't reproduce any issues, it all seems fine to me. I don't know what the issue could be.
Are you using a custom panel template?
If you search online for changing the tinymce editor language, you can add any rules to the config here in core/classes/Input.php
If MCProHosting offer web hosting as well as Minecraft hosting, then sure.
You can disable it in the StaffCP -> Integrations -> Minecraft -> Servers tab.
Yep, you will need to install Nameless yourself on a web host like Pebblehost.