Multilanguage support and non-localized images

support
2

I’m not sure I completely understand your objective, but converting Benutzerverwaltung into a page bundle works great:

content/
├── App1/
│   ├── Verwaltung/
│   │   ├── Benutzerverwaltung/
│   │   │   ├── resources/
│   │   │   │   └── mail-address.png
│   │   │   ├── index.de.md  <-- file name does not begin with underscore
│   │   │   └── index.en.md  <-- file name does not begin with underscore
│   │   ├── _index.de.md
│   │   └── _index.en.md
│   ├── _index.de.md
│   └── _index.en.md
├── _index.de.md
└── _index.en.md

Example:

git clone --single-branch -b hugo-forum-topic-50950 https://github.com/jmooring/hugo-testing hugo-forum-topic-50950
cd hugo-forum-topic-50950
hugo server

This assumes that you have not created a link render hook, and that the themes/modules you are using are not supplying a link render hook.

Resource deduplication for multilingual single-host sites is described here:
https://gohugo.io/content-management/page-resources/#multilingual