Fix multilingual support for product data and thank you redirect

- Add translate: false to price, hasOptions, and optionValues fields
- Make thank you page redirect language-aware (detects /fr/ prefix)
- Ensure stock, weight, dimensions, and options are shared between languages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

site/blueprints/pages/product.yml

@@ -22,6 +22,7 @@ tabs:
                 min: 0
                 step: 0.01
                 required: true
+                translate: false
                 width: 1/4
               stock:
                 label: Stock
@@ -99,6 +100,7 @@ tabs:
                   fr: Options
                 type: toggle
                 default: false
+                translate: false
                 width: 1/7
               optionLabel:
                 label:
@@ -116,6 +118,7 @@ tabs:
                 help:
                   en: "Comma-separated values (e.g.: XS, S, M, L, XL)"
                   fr: "Valeurs séparées par des virgules (ex: XS, S, M, L, XL)"
+                translate: false
                 when:
                   hasOptions: true
                 width: 3/7