templates-de: German document templates, moved in from ownCloud

The 25 files under templates-de/ lived in ~/ownCloud/Persönlich/slohmaier.com/vorlagen/
with no version control. They are the German-language counterpart of the
templates renamed to English in 247b831 — this repo already describes itself as
holding the ASPICE 4.0 / ISO 26262 methodology, templates and tools, so a
second home for templates would have been a duplicate.

Structure preserved as found (business/, engineering/, projekt/, qualitaet/).
No file renamed, no template content changed.

Not moved: vorlagen/slohmaier-doc-template.docx was byte-identical (MD5
31b2d0748eadf0314babf469725ee0b1) to templates-word/slohmaier-doc-template.docx
already in this repo.

Path references fixed in templates-de/README.md, which pointed at locations
that no longer exist: the ownCloud cp examples now clone from Gitea, the
generator script name follows the vorlagen/ -> templates/ rename
(generate_word_vorlagen.sh -> generate_word_templates.sh), the edit workflow
names templates/ and templates-de/ instead of the removed ownCloud copy, and
the master template is referenced at ../templates-word/.

README.md

@@ -177,8 +177,9 @@ Runs on every push and PR:
 | `toolstack/toolstack.md` | Complete tool stack |
 | `gitea-aspice-setup.md` | Setting up Gitea for ASPICE |
 | `dev-process-schaubild.html` | V-model infographic |
-| `templates/` | Markdown templates (source of truth) |
+| `templates/` | Markdown templates, English (source of truth) |
 | `templates-word/` | Generated Word templates + master template `slohmaier-doc-template.docx` |
+| `templates-de/` | The same templates in German, Markdown + Word. Moved here from ownCloud on 2026-07-31; see `templates-de/README.md`. Change a template and both language sets have to follow. |
 | `tools/build_word_template.py` | Builds the neutral Word master template with styles, cover page, document control |
 | `tools/generate_word_templates.sh` | Builds the `.docx` versions from the `.md` templates via pandoc |