German php files?

Checking my WordPress dashboard in the backend, it is all in German, so this might be a WP in German.
However, the site is based on user registration, and confirmation after registration is active. So, WordPress sends these two emails:

1.
To activate your user, please click the following link:
https://<sitename>activation_key=4d2180b620ca…etc..
After you activate it you will receive yet *another email* with your login.

2.
Welcome to <sitename>!
Your username is: <name> and your password is the one that you have selected during registration.
Access your account: https://<sitename&gt;

(I removed the site names).
The case is, although WordPress is in German, these emails, WP sends, are not.
Are perhaps the related php files available in German?

Die Seite, für die ich Hilfe brauche: [Anmelden, um den Link zu sehen]