fix(core): add missing translations for default channel not found (#301)

* fix(core): add missing translations for default channel not found

* fix(core): Revert spanish translations

packages/core/src/i18n/messages/en.json

@@ -24,6 +24,7 @@
     "create-fulfillment-items-already-fulfilled": "One or more OrderItems have already been fulfilled",
     "create-fulfillment-orders-must-be-settled": "One or more OrderItems belong to an Order which is in an invalid state",
     "create-fulfillment-nothing-to-fulfill": "Nothing to fulfill",
+    "default-channel-not-found":  "Default channel not found",
     "email-address-not-available": "This email address is not available",
     "email-address-not-verified": "Please verify this email address before logging in",
     "entity-has-no-translation-in-language": "Translatable entity '{ entityName }' has not been translated into the requested language ({ languageCode })",