fixes #8941: Better error message for duplicate items (#8968)
fixes #8941: Better error message for duplicate items (#8968)

* fixes #8941: Better error message for duplicate items

* gathers all non unique items instead of first encountered non unique item

* renders errored items with `br` instead of `li`

indictranstech/erpnext,gsnbng/erpnext,indictranstech/erpnext,geekroot/erpnext,geekroot/erpnext,Aptitudetech/ERPNext,indictranstech/erpnext,gsnbng/erpnext,geekroot/erpnext,geekroot/erpnext,gsnbng/erpnext,indictranstech/erpnext,gsnbng/erpnext