ModelAdminを適当に継承

from django.contrib import admin

class BaseAdmin(admin.ModelAdmin):

    def construct_change_message(self, request, form, formsets):
        change_message = []
        if form.changed_data:
            for name in form.changed_data:
                new_data = form.cleaned_data[name]
                old_data = form.initial[name]
                change_message.append(u"{}: {} -> {}".format(name, old_data, new_data))

        if formsets:
            for formset in formsets:
                for added_object in formset.new_objects:
                    change_message.append(_('Added %(name)s "%(object)s".')
                                          % {'name': force_text(added_object._meta.verbose_name),
                                             'object': force_text(added_object)})
                for changed_object, changed_fields in formset.changed_objects:
                    change_message.append(_('Changed %(list)s for %(name)s "%(object)s".')
                                          % {'list': get_text_list(changed_fields, _('and')),
                                             'name': force_text(changed_object._meta.verbose_name),
                                             'object': force_text(changed_object)})
                for deleted_object in formset.deleted_objects:
                    change_message.append(_('Deleted %(name)s "%(object)s".')
                                          % {'name': force_text(deleted_object._meta.verbose_name),
                                             'object': force_text(deleted_object)})
        change_message = ', '.join(change_message)
        return change_message or _('No fields changed.')

使うとき

from hoge.models import Hoge

class HogeAdmin(BaseAdmin):
    pass

admin.site.register(Hoge, HogeAdmin)