Customizing admin ui-widget

[kooshan75]

I use django-taggit 0.23.0 and wagtail 2.0.2. My preferred language is Persian (Farsi) in admin's dashboard and one of my language letters is on the "comma" key of keyboard. So, each time I want to use that letter, tag gets submitted and I cannot add tags properly. How can I customize ui-widget in adding/editing tags in admin's dashboard? I also tried to use TAGGIT_TAGS_FROM_STRING & TAGGIT_STRING_FROM_TAGS, but that didn't work neither.

Thanks for the awesome contribution and any solution would be a lot appreciated!!!