[PM 25897] Copy and UI Tweaks for Payment Method Component (#16851)

* Implement the Ui changes to align as expected

* Align the Text in card number, expiration date and security code vertically

* Change the Zip to ZIP

* Remove readonly modifier from signal declarations

apps/browser/src/_locales/en/messages.json

@@ -5721,5 +5721,11 @@
   "settingDisabledByPolicy": {
     "message": "This setting is disabled by your organization's policy.",
     "description": "This hint text is displayed when a user setting is disabled due to an organization policy."
+  },
+  "zipPostalCodeLabel": {
+    "message": "ZIP / Postal code"
+  },
+  "cardNumberLabel": {
+    "message": "Card number"
   }
 }