B3.6 — fix two visual bugs reported on the user's prod PDF:
1. Title 'Spécification technique : Office Translator v3.0' overflowed
its 2-line bbox and overlapped the 'Version du document...' block.
Root cause: MAX_VERTICAL_EXPANSION was 1.5x the original height,
way too small for a long French title. Bumped to 6.0x.
2. 'Avis important' blue background had white rectangular patches.
Root cause: redaction always used fill=(1,1,1) (opaque white),
which erased the colored drawing underneath the text.
Fix: detect when a block's bbox intersects a page drawing,
and use fill=None (transparent) for the redaction in that case.
The original drawing survives intact.
B3.7 — eliminate remaining block-vs-next-block overlap:
Computes each block's 'next_block_y' (the y0 of the nearest block
below it on the same page) and uses it as the ceiling for vertical
expansion. Previously the smart-fit logic used the page bottom as
the ceiling, which let long translated blocks flow into their
neighbour (e.g. 'Pour la dernière version...' overlapping
'8. Résolution des problèmes' in the TOC).
Also includes:
- 9 new tests (6 B3.6 + 3 B3.7) — total 446 tests pass, zero regression
- scripts/verify_b3_6_fix.py — visual+structural verification
- Updated sample_files/test_corpus/test_pdf_translated.pdf with the
clean B3.6+B3.7 output
ROOT CAUSE FIX: PyMuPDF silently raised AttributeError when fontname=None
was passed to insert_textbox. The try/except in _try_insert was swallowing
the error and returning None, causing every block to be skipped via the
graceful failure path. Setting fontname='helv' as the default unblocks
the entire PDF translation pipeline.
SMART-FIT: rewrite _write_translated_block with proper tier-fallback:
- Tier 0: original bbox at original size
- Tier 1: expanded horizontal
- Tier 2: expanded vertical (3x original height)
- Tier 3: shrink once (0.93x)
- Tier 4: shrink twice (0.87x cumulative)
- Tier 5: min size floor (90% for headings, 75% for body)
- Tier 6: graceful skip with visible placeholder
REDACTION: single redaction per block (was per sub-bbox, creating 100+
redaction rectangles per page). Now only 1 redaction per text block.
FEATURE FLAG: PDF_SMART_FIT_ENABLED (default true, observation-first).
METRICS: text_overflow -> format_elements_lost_total.
RESULT ON REAL PDF:
Before: fonts shrunk 22pt->5.6pt, hierarchy destroyed
After: fonts EXACT match: [8, 11, 12, 14, 16, 22] preserved
L1 quality layer — uses a cheap LLM via the OpenAI-compatible API to
validate translation quality. Designed to be the SECOND line of defense
after L0 (script detection, length, pattern).
Architecture:
- sampler.py — picks 5 representative chunks per job (longest first,
skips L0-failed indices, skips too-short or identical pairs)
- llm_judge.py — OpenAI-compatible client, binary verdict per chunk
(accurate / fluent / correct_language / no_leaks), JSON output,
hard timeout, defensive (never raises), cost estimation built in
- pipeline.py — defensive wrapper that integrates both, never breaks
a translation job, always logs a structured event
Integration:
- 5 feature flags in config.py (QUALITY_L1_ENABLED, _LOG_ONLY, etc.)
- QUALITY_L1_LOG_ONLY=true by default: log-only mode, verdict NEVER
blocks or retries a job
- Reuses the chunks extracted by L0 (no double work)
- Passes the set of L0-failed indices so L1 doesn't re-judge them
- Wrapped in try/except so a misconfigured L1 NEVER breaks a job
Default config: deepseek-chat via DeepSeek API
- Cost: ~0.0003 USD per job (5 chunks)
- Speed: typically 1-2s per call, hard ceiling at 8s
- Easy to swap: just set L1_JUDGE_BASE_URL and L1_JUDGE_MODEL
LLM judge is intentionally a SEPARATE model from the translator
(self-evaluation bias mitigation — Meta/Stanford papers 2024-2025).
Tests:
test_sampler.py — 9 tests covering the sampling strategy
test_llm_judge.py — 22 tests covering init, parsing, mocked API,
cost estimation, env factory
test_l1_pipeline.py — 6 tests covering the wrapper
Total new: 37 tests, all pass
Grand total quality+format: 264 tests passing (0 regression)
All 36 new tests + 111 L0 tests + 117 existing translator tests = 264
Phase 1 (observation) for 2 weeks. Then QUALITY_L1_LOG_ONLY=false
to enable auto-retry via the fallback chain.
Word fixes:
W1 — Fix hyperlink double-collect: a run inside <w:hyperlink> was
previously collected twice (once via paragraph.runs, once via
the manual hyperlink iter). Now uses a dedup set of element
ids to collect each run exactly once.
NB: python-docx 1.x's paragraph.runs does NOT include runs
inside hyperlinks, so the iteration now does both:
paragraph.runs (direct children) + a manual iter of all
<w:r> in the tree (catches hyperlink runs).
W2 — Fix footnotes import: used document.part.package.part_related_by
which doesn't exist in python-docx 1.x, so footnotes were never
collected. Now uses document.part.related_parts to find the
footnotes part by content type, walks the XML directly with
lxml (avoids the 'r_lst' error from wrapping foreign elements
in python-docx's Paragraph class), and registers a post-save
callback to re-write the footnotes.xml part with translated
text (since python-docx doesn't manage that part on save).
Same fix applied to endnotes.
W4 — Chart matching by element path: was matching <a:t> and <c:v>
elements by string equality, so two charts with the same text
(e.g. two 'Revenue' series) would only have the first one
translated. Now stores the XPath-like element path at collect
time and navigates to the exact element at apply time. Falls
back to string matching for legacy entries without a path.
Excel fixes:
E2 — Translate cell comments: openpyxl Comment objects are now
collected and their text translated. The Comment object is
replaced in place after translation.
E3 — Translate cell hyperlink display labels: cell.hyperlink.display
(or .target if no display) is collected and translated. The
URL itself is never sent for translation, so it remains
intact. A run that already exists for the cell value is
not double-translated (the dedup check is automatic).
E4 — Chart matching by element path: same fix as W4 but for
Excel. Two charts in the same workbook with the same text
now each get their own translation.
Tests:
Added tests/test_translators/test_b1_format_fixes.py with 11 tests
covering all the fixes. All 11 pass. Existing translator tests
(38 word + 38 excel + 30 pptx = 106) still pass — 0 regressions.
Total tests for the quality+format layer: 228 passing
(111 L0 Python + 63 L0 TypeScript + 11 B1 + 43 other translator).
All fixes are surgical: existing translation flow is preserved.
The only new file path through the code is for footnotes/endnotes
which previously didn't work at all.
L0 quality detection layer to catch translation failures BEFORE they
reach users. Pure Python/TypeScript, zero new dependencies, no API calls.
Backend (Python — services/quality/):
- Script detection: 145 langs mapped to 23 scripts (Latin, Cyrillic,
Greek, Arabic, Hebrew, CJK, Hangul, Kana, Devanagari, Bengali, etc.)
- Language confusion detection (e.g. Arabic text for French target)
- Arabic-script variant discrimination (Persian/Urdu/Pashto/Kurdish
confusion — e.g. Persian text returned when Arabic was requested)
- Length sanity check (with numeric/short-source exemptions)
- Prompt leak detection (Translation: / Voici la traduction: / 翻译:)
- Repetition hallucination detection (token + character level)
- File text extraction for .docx/.xlsx/.pptx/.pdf (no translator
changes needed)
- Defensive pipeline that never raises (L0 must NEVER break a job)
Frontend (TypeScript — wordly.art---traduction-de-documents/src/utils/):
- Exact 1:1 mirror of the Python module
- Zero dependencies, works in browser AND Node.js
- Native Unicode regex (\\p{L}/u) and codePoint iteration
- 63 tests using Node's built-in test runner
Integration:
- Feature-flagged: QUALITY_L0_ENABLED=false (default)
- Observation only: logs structured events, never modifies files
- try/except wrapped: impossible to break a translation job
- Lazy imports: only loaded when flag is on
- Zero impact on existing tests / behavior
Tests:
- 111 Python tests covering all paths (config, script, length, leak,
pipeline, file_extractor) — 100% pass
- 63 TypeScript tests (Node --test) — 100% pass
- 174/174 total tests for the L0 layer
Bug fixes in script mapping:
- yi (Yiddish) -> hebrew (was incorrectly mapped to arabic)
- dv (Maldivian) -> thaana (was incorrectly mapped to arabic)
- ja (Japanese) -> hiragana_katakana (distinguishes from Chinese CJK)
Phase 1 (backend) + Phase 2 (frontend) of Track A complete.
Next: Track B1 (Word/Excel format preservation quick wins).
Closes Track A phase 1+2 of the dev plan.
Frontend:
- Fix Framer Motion / motion-dom build error by pinning framer-motion to
11.18.2 (compatible with React 19 and Next.js 16).
- Add cross-env and build:local script to bypass standalone symlink errors
on Windows without Developer Mode.
- Allow NEXT_OUTPUT=default to disable standalone output for local builds.
- Refactor i18n: split 14,177-line src/lib/i18n.tsx into per-locale,
per-namespace JSON files under src/lib/i18n/messages/.
- Load English synchronously; other locales loaded on demand via dynamic
imports (reduces initial bundle, improves maintainability).
- Remove unused next-intl message files src/messages/en.json and fr.json.
Backend:
- Remove insecure legacy /api/v1/download/{filename} and /api/v1/cleanup/{filename}
endpoints. The job-based /api/v1/download/{job_id} already enforces ownership.
- Deduplicate texts in TranslationService.translate_batch before sending them
to the provider, reducing API calls for repeated strings.
- Pin httpx to <0.28 to fix TestClient incompatibility with starlette 0.35.1.
- Add pytest-cov and ruff dev dependencies/config.
DevOps:
- Remove hardcoded Grafana password from docker-compose.yml and
docker-compose.monitoring.yml; use GRAFANA_PASSWORD env var.
- Change default TRANSLATION_SERVICE from ollama to google in
docker-compose.yml (Ollama is an optional profile).
- Add GRAFANA_PASSWORD to .env.example.
- Add .coverage and frontend/pnpm-workspace.yaml to .gitignore.
Tests:
- Update API versioning tests for removed legacy endpoints.
- Add tests/test_translation_service.py for deduplication behavior.
Verified:
- pnpm run build:local passes.
- uv run pytest tests/test_providers/* tests/test_translation_service.py
tests/test_story_3_5_api_versioning.py tests/test_download_endpoint.py
tests/test_translators/test_excel_translator.py: provider/translator tests
pass; one pre-existing French error-message test still fails (message is
returned in English, unrelated to this change).
Major changes across backend, frontend, infrastructure:
- Provider system with model selection (Google, DeepL, OpenAI, Ollama, Google Cloud)
- Admin panel: user management, pricing, settings
- Glossary system with CSV import/export
- Subscription and tier quota management
- Security hardening (rate limiting, API key auth, path traversal fixes)
- Docker compose for dev, prod, and IONOS deployment
- Alembic migrations for new tables
- Frontend: dashboard, pricing page, landing page, i18n (en/fr)
- Test suite and verification scripts
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
