Rule to validate maximal length of denomination

* Added rule to prevent entry beyond 25 characters

Fixes #176

Author: jadrake75

resources/locales/en/stamp-web.json

@@ -130,6 +130,7 @@
         "countryRequired": "Country is required",
         "currencyInvalid": "Not a currency value",
         "descriptionRequired": "Description is required",
+        "rateMaxLength": "Denomination exceeds 25 characters",
         "rateRequired": "Denomination is required",
         "totalPurchaseCurrencyInvalid": "Total purchase not a currency value",
         "totalPurchaseNumber": "Total purchase out of allowed range",

src/resources/elements/stamps/stamp-details.js

@@ -102,6 +102,7 @@ export class StampDetailsComponent extends EventManaged {
         ValidationRules
             .ensure('rate')
             .required().withMessage(this.i18n.tr('messages.rateRequired'))
+            .maxLength(25).withMessage(this.i18n.tr('messages.rateMaxLength'))
             .ensure('description')
             .required().withMessage(this.i18n.tr('messages.descriptionRequired'))
             .ensure('countryRef')