Olivier Adam

if not available, I think I could contribute a PR to add it as a feature

What do you mean exactly ?

Django has a [`save_as`](https://docs.djangoproject.com/en/1.8/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_as) feature for ModelAdmin (like for duplicating tenants). Unfortunately I haven't found an equivalent feature for `TabularAdmin`

Actually I think the right way to implement that is to add a [custom action](https://docs.djangoproject.com/en/dev/ref/contrib/admin/actions/) to the TabularInline. The action could be either "duplicate selected payments" or "duplicate last payment...

:+1:

@daniellockyer do you think this PR adds value ?

Good thing you did not merge this before, since it was not working at all :sweat_smile: Now it is working fine (I'm using my fork in my build)

The typescript version of this supports different languages : https://zxcvbn-ts.github.io/zxcvbn/guide/ . I think for the moment I'll have to use it and invoke it from php via `exec`