Updated PLANS.md, AGENTS.md, and arabic-localization.md to reflect the “foundations now, full translations later” approach and marked progress accordingly.

Implemented localization foundations across backend and frontend (locale settings/middleware, preferred language, i18n wiring, RTL support, minimal Arabic UI strings, Accept-Language).
Added targeted backend and frontend tests plus a risks note for pending full translation coverage.

backend/salon_api/settings.py

@@ -31,10 +31,12 @@ INSTALLED_APPS = [
 MIDDLEWARE = [
     "django.middleware.security.SecurityMiddleware",
     "django.contrib.sessions.middleware.SessionMiddleware",
+    "django.middleware.locale.LocaleMiddleware",
     "corsheaders.middleware.CorsMiddleware",
     "django.middleware.common.CommonMiddleware",
     "django.middleware.csrf.CsrfViewMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "apps.accounts.middleware.UserLocaleMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
 ]
@@ -96,7 +98,12 @@ AUTH_PASSWORD_VALIDATORS = [
     {"NAME": "django.contrib.auth.password_validation.NumericPasswordValidator"},
 ]
 
-LANGUAGE_CODE = "en-us"
+LANGUAGE_CODE = "ar-sa"
+LANGUAGES = [
+    ("ar-sa", "Arabic (Saudi Arabia)"),
+    ("en", "English"),
+]
+LOCALE_PATHS = [BASE_DIR / "locale"]
 TIME_ZONE = "Asia/Riyadh"
 USE_I18N = True
 USE_TZ = True