Rewrite translated URLs

[adamchainz]

It's theoretically possible to rewrite old url() calls using translation to the new path format, e.g.

-from django.conf.urls import url
+from django.urls import re_path
 from django.utils.translation import gettext_lazy as _

-url(_(r'^about/$'), views.about)
+path(_(r'about/'), views.about)

State.from_imports would need extending to track aliases as it currently ignores them.

[adamchainz]

Or we could just track the import independently in the fixer module, like in the recent admin fixers.