1) You would need to physically modify the S5 Register Module parameters and the language file on the server. As long as you are using the latest version of S5 Register it should detect the users chosen language pack and translate accordingly. It currently looks like your language fields aren't setup correctly for that user.
Nice, now I know what problem I have, but not how to solve it.
Please tell me what should I set.
I am a bloody beginner.
And English, I can also not as good