TT-011 — Localisation (i18n)

Type: Story
Priority: Medium
Labels: i18n, l10n, infrastructure
Depends on: TT-001
Blocks: TT-006, TT-007, TT-008, TT-009, TT-010

Summary

Set up flutter_localizations with ARB files for English (en) and German (de). All UI strings must be externalised — no hardcoded display text in widget files.

Setup

l10n.yaml (project root)

arb-dir: lib/core/l10n
template-arb-file: app_en.arb
output-localization-file: app_localizations.dart
output-class: AppLocalizations

File structure

lib/core/l10n/
  app_en.arb    ← template (English)
  app_de.arb    ← German translations

Generated: lib/core/l10n/app_localizations.dart (do not edit manually)

Usage in widgets

import 'package:timetrack/core/l10n/app_localizations.dart';
// ...
Text(AppLocalizations.of(context)!.timerStart)

Strings to externalise (minimum set)

"navTimer": "Timer",
"navEntries": "Entries",
"navProjects": "Projects",
"navReports": "Reports",
"navSettings": "Settings"

Timer

"timerStart": "Start",
"timerStop": "Stop",
"timerDiscard": "Discard",
"timerDiscardConfirm": "Discard this entry?",
"timerSelectProject": "Select project",
"timerAddNote": "Add a note…",
"timerTodayTotal": "Today: {duration}"

Entries

"entriesTitle": "Entries",
"entriesEmpty": "No entries yet",
"entriesAdd": "Add entry",
"entriesDeleteUndo": "Entry deleted",
"entriesUndo": "Undo"

Projects

"projectsTitle": "Projects",
"projectsEmpty": "No projects yet",
"projectsAdd": "Add project",
"projectsActive": "Active",
"projectsArchived": "Archived",
"projectsName": "Name",
"projectsDescription": "Description",
"projectsArchive": "Archive",
"projectsDeleteBlocked": "Cannot delete — project has entries"

Reports

"reportsTitle": "Reports",
"reportsDay": "Day",
"reportsWeek": "Week",
"reportsMonth": "Month",
"reportsTotal": "Total",
"reportsNoData": "No data for this period"

Settings / Export

"settingsTitle": "Settings",
"settingsTheme": "Theme",
"settingsThemeSystem": "System",
"settingsThemeLight": "Light",
"settingsThemeDark": "Dark",
"settingsLanguage": "Language",
"settingsExport": "Export data",
"exportFormat": "Format",
"exportRange": "Date range",
"exportShare": "Share"

Common

"cancel": "Cancel",
"save": "Save",
"delete": "Delete",
"edit": "Edit",
"confirm": "Confirm"

Acceptance Criteria

l10n.yaml present at project root
app_en.arb contains all strings listed above
app_de.arb contains all German translations (no English fallback strings)
flutter gen-l10n (or flutter pub get) generates app_localizations.dart
Zero hardcoded display strings in any presentation/ file
Switching language in Settings updates all visible strings immediately
Widget test: locale override renders German strings

Files to create

l10n.yaml
lib/core/l10n/app_en.arb
lib/core/l10n/app_de.arb

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