Optimizations, notification improvements and Chinese language bug fix

Explore our newest updates 👇👀

• We have optimized our rates and orders services, to give you an even better experience with our app.
• You can now add DMARC/DKIM verification for your email notifications.
• If you were using Shopify in the Chinese language, there were issues with creating and editing locations within Zapiet - Pickup + Delivery due to Shopify not supporting the zh-Hans locale code. We will now fallback to zh-CN locale code when you are using Chinese to make sure everything works as expected.