Describe your changes

1. Changes "Project overview" to "Kiezradar" in breadcrumbs where the change hasn't been made yet
2. Removes the conditional display of the module page in breadcrumbs (since we now always show a project page and a module page)
3. Changes links back to the module page to always lead to the module page, and not back to the project page in case it's a single-module project
4. (fixed a test that started failing after running make mo)

fixes #6130

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