feat(i18n): localize auth, dashboard, contact

[TiZorii]

• Add translations for login/signup pages (uk/en/pl)
• Implement dashboard i18n with stats and activity
• Add contacts page translations

Summary by CodeRabbit

Release Notes

• New Features
  • Multi-language support added for authentication flows (login, signup, password reset, forgot password)
  • Dashboard and contacts pages now display in your selected language
  • Page titles and descriptions automatically adjust based on language preference

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[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request adds comprehensive internationalization (i18n) support across authentication, contact, and dashboard pages. It replaces static metadata with locale-aware generateMetadata functions, converts hard-coded UI strings to translation lookups via getTranslations and useTranslations hooks, and introduces new translation bundles in English, Polish, and Ukrainian covering auth flows, contact information, and dashboard features.

Changes

Cohort / File(s)	Summary
Page Components frontend/app/[locale]/contacts/page.tsx, frontend/app/[locale]/dashboard/page.tsx	Replaced static metadata objects with async generateMetadata functions that fetch locale-based translations; converted page components to async and replaced hard-coded UI strings with t(...) translation lookups; updated locale-dependent date formatting and ProfileCard invocation to pass locale prop
Auth Components frontend/components/auth/AuthProvidersBlock.tsx, frontend/components/auth/ForgotPasswordForm.tsx, frontend/components/auth/LoginForm.tsx, frontend/components/auth/ResetPasswordForm.tsx, frontend/components/auth/SignupForm.tsx	Added "use client" directive (where needed) and integrated useTranslations hook; replaced all hard-coded UI text (titles, buttons, error messages, verification prompts) with translation key lookups; maintained existing control flow and component signatures
Auth Field Components frontend/components/auth/fields/EmailField.tsx, frontend/components/auth/fields/NameField.tsx, frontend/components/auth/fields/PasswordField.tsx	Added i18n support via useTranslations hook; replaced hard-coded placeholder and label text with translation lookups; removed placeholder prop from NameField and PasswordField type definitions as these are now derived from translations
Dashboard Components frontend/components/dashboard/ProfileCard.tsx, frontend/components/dashboard/QuizSavedBanner.tsx, frontend/components/dashboard/StatsCard.tsx	Added useTranslations hook integration; replaced static UI strings with translation keys; updated ProfileCard to accept and use locale prop for date formatting; preserved existing data flow and structural logic
Translation Files frontend/messages/en.json, frontend/messages/pl.json, frontend/messages/uk.json	Added comprehensive new top-level translation objects: auth (with login, signup, forgotPassword, resetPassword, fields, divider sub-keys), contacts (metaTitle, metaDescription, title, subtitle, contact fields), and dashboard (metaTitle, metaDescription, title, subtitle, supportLink, profile, stats, quizSaved sub-keys) across all three language files

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• (SP:2) [Frontend] refactor: modularize auth pages and unify layout, fields, and banners #159: This PR directly introduces i18n infrastructure and updates multiple auth/dashboard components (LoginForm, SignupForm, ForgotPasswordForm, ResetPasswordForm, field components, ProfileCard) that align with the current changes.

Suggested reviewers

• AM1007
• ViktorSvertoka

Poem

🐰 A rabbit hops through text so plain,
Swapping words in i18n's refrain,
English, Polish, Ukrainian fair,
Now every locale gets its share! 🌍
Translation keys in every file,
Making the whole world smile! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately describes the main change: adding internationalization (i18n) support for authentication, dashboard, and contact pages across multiple language files and components.

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✨ Finishing touches

• 📝 Generate docstrings

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