# Session Context — LVT4U Plugin
**Saved:** 2026-07-16T17:25 (GMT+7)
**Version:** v2.7.67

## Work Done This Session

### 🌐 Full Bilingual i18n (EN ↔ VI) — No Restart Required

**Problem:** Switching language left Toolbar + Menu + LayerCompare in Vietnamese

**Root Causes Found:**
1. `_section()` in `_build_menu()` did NOT call `tr()` → section headers never translated
2. All menu action strings were hardcoded Vietnamese → `tr()` couldn't translate EN→VI
3. `_build_toolbar()`: section headers used `QAction(hdr, ...)` without `tr(hdr)`
4. Toolbar button labels hardcoded Vietnamese (e.g. `"Bản đồ nền"`) as `tr()` keys → fail
5. `layer_compare/dialog.py` had NO `tr()` import, NO `language_changed` connection

**Files Fixed:**
- `shared/i18n.py` — +50 new translations (menu sections, toolbar labels, Layer Compare dialog)
- `lvt_plugin.py` — `_section()` now calls `tr()`, all menu+toolbar strings → English base
- `layer_compare/dialog.py` — Full i18n rewrite: `_retranslate_ui()` + `language_signals` connect

**Versions:**
- v2.7.65: NameError closure fix in tool.py
- v2.7.66: Full i18n for Menu + Layer Compare
- v2.7.67: Toolbar fully bilingual (all 6 buttons + dropdown section headers)

## Active Rules
- Auto-commit + push whenever version bumped + build OK
- Author = "Lộc Vũ Trung" on all output files

## Next Steps
- Monitor language switching behavior after user installs v2.7.67
- KML/KMZ Polygon Extraction UI (not started)
