Update translations and add trial eligibility in plan picker

Added translations in "plan-picker" for better localization support. Introduced a new functionality to check trial eligibility where existing customers can't start a trial. Removed unnecessary billing line items like 'per-seat' and 'metered'. Also, made significant changes in multiple files to align with the updated internationalization best practices. The changes aim to make application more user-friendly across different locales and provide accurate trial period conditions.

apps/web/config/billing.config.ts

@@ -28,22 +28,6 @@ export default createBillingSchema({
               cost: 9.99,
               type: 'base',
             },
-            {
-              id: 'price_1NNwYHI1i3VnbZTqI2UzaHIe6',
-              name: 'Per Seat',
-              description: 'Add-on plan',
-              cost: 1.99,
-              type: 'per-seat',
-            },
-            {
-              id: 'price_1NNwYHI1i3VnbZTqI2UzaHIe7',
-              name: 'Metered',
-              description: 'Metered plan',
-              cost: 0.99,
-              type: 'metered',
-              unit: 'GB',
-              included: 10,
-            },
           ],
         },
         {