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/public/locales/en/common.json

@@ -57,9 +57,5 @@
       "label": "Member",
       "description": "Cannot invite members or change settings"
     }
-  },
-  "billingInterval": {
-    "month": "Billed monthly",
-    "year": "Billed yearly"
   }
 }