add phone number validation to update account form

public/locales/en/common.json

@@ -128,6 +128,9 @@
     "amount": "Amount",
     "selectDate": "Select date"
   },
+  "formFieldError": {
+    "invalidPhoneNumber": "Please enter a valid Estonian phone number (must include country code +372)"
+  },
   "wallet": {
     "balance": "Your MedReport account balance",
     "expiredAt": "Valid until {{expiredAt}}"