feat(i18n): full English translation of demo-epb

Phase 2 of the English translation:

Word documents (filled, EPB-specific):
- 8 plans (PID, PM, QA, SWE, Test, Project Manual, CM, RM)
- 6 safety docs (HARA, Safety Case, FMEDA, MISRA Compliance,
  Verification Report, Tool Qualification Cppcheck)
- 2 manuals (User, Service)
- 3 audit artefacts (Review minutes, NC-001, MISRA-REC-001)
- All regenerated via pandoc from English markdown sources

Code, tests, headers:
- All file headers, struct comments, function docstrings in English
- All test names (TEST_BEGIN strings) translated
- Inline comments translated
- 46 tests still green after translation

CI workflows:
- All step names in English
- Step descriptions, comments, release notes template in English

README.md fully rewritten in English with proper guided tour.

Phase 3 (still pending): dev-process repo templates + toolstack/setup docs.

docs/plans-md/QA-Plan.md

@@ -1,67 +1,67 @@
-# Qualitaetssicherungs-Plan (QA-Plan)
+# Quality Assurance Plan (QA Plan)
 
-| Feld            | Wert                                |
+| Field           | Value                                |
 |-----------------|--------------------------------------|
-| Projekt         | demo-epb                             |
-| Datum           | 2026-05-11                           |
+| Project         | demo-epb                             |
+| Date            | 2026-05-11                           |
 | Version         | 1.0                                  |
-| Status          | Freigegeben                          |
+| Status          | Released                             |
 
 ---
 
-## 1. Qualitaetsziele
+## 1. Quality goals
 
-- Vollstaendige Traceability: SYS → SA → SWE → SWA → Code → Test
-- 0 MISRA-Required-Violations (Deviations dokumentiert)
-- 0 statische-Analyse-Findings auf High/Error-Level
-- Coverage-Ziele (siehe SWE-Plan Abschnitt 8) eingehalten
-- Alle PRs reviewed und approved
+- Complete traceability: SYS → SA → SWE → SWA → Code → Test
+- 0 MISRA Required violations (deviations documented)
+- 0 static-analysis findings at High / Error level
+- Coverage targets met (see SWE Plan section 8)
+- All PRs reviewed and approved
 
-## 2. Qualitaetsmassnahmen
+## 2. Quality measures
 
-| Massnahme                       | Tool / Methode             | Frequenz       |
-|---------------------------------|----------------------------|----------------|
-| Traceability-Check              | `doorstop check`           | jeder Push     |
-| MISRA-Check                     | Cppcheck + MISRA-Addon     | jeder Push     |
-| Static Analysis                 | Cppcheck, clang-tidy       | jeder Push     |
-| Unit Tests                      | CppUTest                   | jeder Push     |
-| Coverage                        | gcov / lcov                | jeder Push     |
-| Peer Review                     | Gitea PRs                  | jede Aenderung |
-| Architektur-Review              | Technical Review, 2 Approver | bei Aenderung |
-| Audit-Vorbereitung              | doorstop publish + Word-Doku | bei Release  |
+| Measure                          | Tool / Method               | Frequency       |
+|----------------------------------|------------------------------|------------------|
+| Traceability check               | `doorstop check`             | every push       |
+| MISRA check                      | Cppcheck + MISRA addon       | every push       |
+| Static analysis                  | Cppcheck, clang-tidy         | every push       |
+| Unit tests                       | CppUTest                     | every push       |
+| Coverage                         | gcov / lcov                  | every push       |
+| Peer review                      | Gitea PRs                    | every change     |
+| Architecture review              | Technical review, 2 approvers | on changes      |
+| Audit preparation                | doorstop publish + Word docs | on release       |
 
 ## 3. Reviews
 
-| Artefakt                    | Review-Typ        | Min. Approver |
-|-----------------------------|-------------------|----------------|
-| Anforderungen               | Technical Review  | 1              |
-| Architektur-Element         | Technical Review  | 2              |
-| Code (QM / ASIL-A/B)        | Peer Review       | 1              |
-| Code (ASIL-C/D)             | Technical Review  | 2              |
-| Plaene und Berichte         | Peer Review       | 1              |
-| MISRA Deviation Permit      | Technical Lead    | 1              |
+| Artefact                       | Review type        | Min. approvers |
+|--------------------------------|---------------------|-----------------|
+| Requirements                   | Technical review    | 1               |
+| Architecture element           | Technical review    | 2               |
+| Code (QM / ASIL-A/B)           | Peer review         | 1               |
+| Code (ASIL-C/D)                | Technical review    | 2               |
+| Plans and reports              | Peer review         | 1               |
+| MISRA deviation permit         | Technical lead      | 1               |
 
-## 4. Non-Conformity Management
+## 4. Non-conformity management
 
-Abweichungen vom Plan oder von Anforderungen werden als Non-Conformity (NC) dokumentiert:
+Deviations from the plan or from requirements are documented as a non-conformity (NC):
 
-- Pfad: `docs/non-conformities/NC-XXX.docx`
-- Jede NC erhaelt eine eindeutige ID
-- Schwere-Klassifizierung: Critical / Major / Minor
-- Korrekturmassnahme und Verifikation werden nachgehalten
-- Beispiel-NC vorhanden: NC-001
+- Path: `docs/non-conformities/NC-XXX.docx`
+- Each NC has a unique ID
+- Severity classification: Critical / Major / Minor
+- Corrective action and verification are tracked
+- Example NC present: NC-001
 
-## 5. Audit-Vorbereitung
+## 5. Audit preparation
 
-Audit-Faehigkeit wird durchgehend erhalten:
+Audit readiness is maintained continuously:
 
-- Git-History ist Audit-Trail (kein direkter Push auf `main`)
-- `docs/plans-md/` enthaelt die freigegebenen Plaene (Word in `docs/` daneben)
-- `docs/traceability/` enthaelt automatisch generierte Matrizen
-- `misra/records/` enthaelt MISRA-Deviation-Records
-- `tests/results/` enthaelt Test- und Coverage-Reports (CI-Artefakte)
-- `docs/reviews/` enthaelt Review-Protokolle
+- Git history is the audit trail (no direct push to `main`)
+- `docs/plans-md/` holds the released plans (Word in `docs/` alongside)
+- `docs/traceability/` holds the auto-generated matrices
+- `misra/records/` holds MISRA deviation records
+- `tests/results/` holds test and coverage reports (CI artefacts)
+- `docs/reviews/` holds review minutes
 
-## 6. Verbesserungsmassnahmen
+## 6. Improvement actions
 
-Jeder Sprint-Abschluss enthaelt eine kurze Lessons-Learned-Notiz in `docs/lessons-learned/`. In dieser Demo verzichtet, da Single-Sprint-Projekt.
+Every sprint closure includes a brief lessons-learned note in `docs/lessons-learned/`. Skipped in this demo because it is a single-sprint project.