Gunnar, thank you for your help. Here are my results:
__________________________________________

locale

LANG=de_DE.UTF-8
LANGUAGE=de:en
LC_CTYPE=de_DE.UTF-8
LC_NUMERIC=de_DE.UTF-8
LC_TIME=de_DE.UTF-8
LC_COLLATE=de_DE.UTF-8
LC_MONETARY=de_DE.UTF-8
LC_MESSAGES=de_DE.UTF-8
LC_PAPER=de_DE.UTF-8
LC_NAME=de_DE.UTF-8
LC_ADDRESS=de_DE.UTF-8
LC_TELEPHONE=de_DE.UTF-8
LC_MEASUREMENT=de_DE.UTF-8
LC_IDENTIFICATION=de_DE.UTF-8
LC_ALL=
__________________________________________

cat /etc/default/locale

LANG="de_AT.UTF-8"
LANGUAGE="de_AT:de"

__________________________________________

cat ~/.pam_environment

LANGUAGE        DEFAULT=en
LANG    DEFAULT=en_US.UTF-8
LC_NUMERIC=de_DE.UTF-8
LC_TIME=de_DE.UTF-8
LC_MONETARY=de_DE.UTF-8
LC_PAPER=de_DE.UTF-8
LC_NAME=de_DE.UTF-8
LC_ADDRESS=de_DE.UTF-8
LC_TELEPHONE=de_DE.UTF-8
LC_MEASUREMENT=de_DE.UTF-8
LC_IDENTIFICATION=de_DE.UTF-8
PAPERSIZE=a4
__________________________________________

I did not do any manual language configuring.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1778225

Title:
  Can't switch UI language for single users, only system-wide

Status in gnome-control-center package in Ubuntu:
  Incomplete

Bug description:
  The title says it all ... I tried to switch the language of the user
  interface to English instead of German for a single user, which did
  not work. Applying the new language system-wide did the job, but
  forced all other users on that pc to have their graphical sessions in
  the new language too.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-control-center 1:3.28.1-0ubuntu1.18.04.1
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jun 22 14:56:26 2018
  SourcePackage: gnome-control-center
  UpgradeStatus: Upgraded to bionic on 2018-05-29 (23 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1778225/+subscriptions

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