i18n: Tweak makemessages for Django 3.1 parameters.
i18n: Tweak makemessages for Django 3.1 parameters.

Apparently the default for how this works changed in the Django 2.1 to
3.1 upgrade.

andersk/zulip,zulip/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,zulip/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,punchagan/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,andersk/zulip