refactor: modify response json

client/core/utils/errorCodes.h

@@ -115,12 +115,13 @@ namespace amnezia
         AbortError = 1205,
 
         // Billing errors
-        BillingError = 1300,
-        BillingGooglePlayError = 1301,
-        BillingUnavailable = 1302,
-        SubscriptionAlreadyOwned = 1303,
-        SubscriptionUnavailable = 1304,
-        BillingNetworkError = 1305,
+        BillingCanceled = 1300,
+        BillingError = 1301,
+        BillingGooglePlayError = 1302,
+        BillingUnavailable = 1303,
+        SubscriptionAlreadyOwned = 1304,
+        SubscriptionUnavailable = 1305,
+        BillingNetworkError = 1306,
       };
       Q_ENUM_NS(ErrorCode)
     }

client/core/utils/errorStrings.cpp

@@ -107,6 +107,7 @@ QString errorString(ErrorCode code) {
     case(ErrorCode::AbortError): errorMessage =  QObject::tr("QFile error: The operation was aborted"); break;
 
     // Billing errors
+    case(ErrorCode::BillingCanceled): errorMessage = QObject::tr("Transaction was canceled by the user"); break;
     case(ErrorCode::BillingError): errorMessage = QObject::tr("Billing error"); break;
     case(ErrorCode::BillingGooglePlayError): errorMessage = QObject::tr("Internal Google Play error, please try again later"); break;
     case(ErrorCode::BillingUnavailable): errorMessage = QObject::tr("Billing is unavailable, please try again later"); break;