Welcome message/email in wrong language

I’m testing out the multisite in my language, norwegian. I have changed the registrationmessage (in Network admin) to norwegian language but when I registered a new site I still get the message in english language.

It even looks like it’s not using the text from Network admin at all since the standard text is:

Dear User,

Your new SITE_NAME site has been successfully set up at:
BLOG_URL

You can log in to the administrator account with the following information:
Username: USERNAME
Password: PASSWORD
Log in here: BLOG_URLwp-login.php

We hope you enjoy your new site. Thanks!

–The Team @ SITE_NAME

and the email I got sounds like this:

To activate your blog, please click the following link:

https://test.mysite.com/wp-activate.php?key=f42g269f28gf7c6c

After you activate, you will receive *another email* with your login.

After you activate, you can visit your site here:

https://test.mysite.com/

Any idea?