babel extractors are now registered via python entry points,
so there is no need to declare babel extractors in babel configs.
This change is important to make translation work in Django 2.2.
django-babel does not work with Django 2.2 and looks unmaintained
for over two years. The horizon team is thinking to switch the extractor
to enmerkar (a fork of django-babel) to make extraction of translation
string work again near future. It is important to drop the extractor
definition to make the transition smooth.
Change-Id: Ic65ce73cc2c3ce0a2e346e2a0cd64f7b9342b592
Currently strings in Django templates cannot be translated
because the current recommended file pattern "templates/**.html"
does not match Django templates in subdirectories.
This needs to be "**/templates/**.html".
Change-Id: I246aa6fb86a5f2c3a7a3cc9f537678ba8d3e2fdd
Closes-Bug: #1747453
ZhouHeng