[Koha] BANQ server returning no results

Hello everyone, I have some records for resources with titles in French. When I try to add them through Z39.50 using BANQ server, its returning no results. However, if I search in BANQ's library that resource is available. I found something related to this - https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=11297. But, I am unable to implement this in my Koha library. Can anyone help me with this. Regards, Gurpreet