Explicitly set localization assumptions for the build and testsuite

Description

Apparently contributors who have their system configured for German localization have some integration tests fail, because of assumptions of our testsuite.

The proposed solution is to configure our build to set the environment variables explicitly.

Environment

None

Assignee

Falko Modler

Reporter

Sanne Grinovero

Fix versions

Labels

None

backPortable

Backport?

Suitable for new contributors

None

Requires Release Note

None

Pull Request

None

backportDecision

None

Components

Priority

Minor
Configure