fix(storefront-i18n): dashboard widgets translate + correct customer-module key paths

Two bugs from Test 5.1 on FR storefront dashboard:

1. Loyalty + Orders dashboard cards (`StorefrontDashboardCard.title`/
   `subtitle`/`value_label`) were hardcoded English. Added `language`
   to `WidgetContext`; customer dashboard route passes
   `request.state.language` through; loyalty and orders widget
   providers now call `translate(..., context.language)` with new
   `widget.*` i18n keys × 4 locales each.

2. Customer-module locale JSON has redundant top-level `customers`
   wrapper, so after the module-locale loader auto-namespaces under
   module code `customers`, the actual key path is
   `customers.customers.customer_number` (matches the existing
   `loyalty.loyalty.wallet.apple` pattern). My earlier sweep used the
   single-prefix path for 8 references — fixed all to double-prefix.

Both bugs were visible end-of-day yesterday after the api container
recreate landed `1bade6e6`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/modules/loyalty/locales/de.json

@@ -1,4 +1,12 @@
 {
+  "widget": {
+    "rewards": {
+      "title": "Treueprogramm",
+      "subtitle_member": "Punkte und Prämien anzeigen",
+      "subtitle_join": "Unserem Treueprogramm beitreten",
+      "value_label": "Punktestand"
+    }
+  },
   "loyalty": {
     "module": {
       "name": "Treueprogramme",

app/modules/loyalty/locales/en.json

@@ -1,4 +1,12 @@
 {
+  "widget": {
+    "rewards": {
+      "title": "Loyalty Rewards",
+      "subtitle_member": "View your points & rewards",
+      "subtitle_join": "Join our rewards program",
+      "value_label": "Points Balance"
+    }
+  },
   "loyalty": {
     "module": {
       "name": "Loyalty Programs",

app/modules/loyalty/locales/fr.json

@@ -1,4 +1,12 @@
 {
+  "widget": {
+    "rewards": {
+      "title": "Programme de fidélité",
+      "subtitle_member": "Voir vos points et récompenses",
+      "subtitle_join": "Rejoindre notre programme de fidélité",
+      "value_label": "Solde de points"
+    }
+  },
   "loyalty": {
     "module": {
       "name": "Programmes de Fidélité",

app/modules/loyalty/locales/lb.json

@@ -1,4 +1,12 @@
 {
+  "widget": {
+    "rewards": {
+      "title": "Treieprogramm",
+      "subtitle_member": "Är Punkten a Belounungen kucken",
+      "subtitle_join": "Eisem Treieprogramm bäitrieden",
+      "value_label": "Punktenzuel"
+    }
+  },
   "loyalty": {
     "module": {
       "name": "Treieprogrammer",

app/modules/loyalty/services/loyalty_widgets.py

@@ -51,6 +51,7 @@ class LoyaltyWidgetProvider:
     ) -> list[StorefrontDashboardCard]:
         """Provide the Loyalty Rewards card for the customer dashboard."""
         from app.modules.loyalty.models.loyalty_card import LoyaltyCard
+        from app.utils.i18n import translate
 
         card = (
             db.query(LoyaltyCard)
@@ -62,17 +63,26 @@ class LoyaltyWidgetProvider:
         )
 
         points = card.points_balance if card else None
-        subtitle = "View your points & rewards" if card else "Join our rewards program"
+        lang = context.language if context else None
+        subtitle_key = (
+            "loyalty.widget.rewards.subtitle_member"
+            if card
+            else "loyalty.widget.rewards.subtitle_join"
+        )
 
         return [
             StorefrontDashboardCard(
                 key="loyalty.rewards",
                 icon="gift",
-                title="Loyalty Rewards",
-                subtitle=subtitle,
+                title=translate("loyalty.widget.rewards.title", lang),
+                subtitle=translate(subtitle_key, lang),
                 route="account/loyalty",
                 value=points,
-                value_label="Points Balance" if points is not None else None,
+                value_label=(
+                    translate("loyalty.widget.rewards.value_label", lang)
+                    if points is not None
+                    else None
+                ),
                 order=30,
             ),
         ]