+ A new error type is added to display invalid input errors. User is navigated to DD error page if there is a problem with input CSV. Unexpected errors are still forwarded to Apache error page.
+ Log messages are updated to give more clear information to user
+ Purge option is divided into 2. User can select purging vocabulary data only or purging both vocabulary data and bounded elements. This is added in case of users wants to delete all vocabulary concepts and insert new ones. In such case, there can be situations to block user to bulk edit via CSV (when it is found more than one data element to bind).
Refs: #18169