Weblate: Fix TLS configuration (sysadmin#17339)

Zen Furequested to merge
sysadmin/17339/fix-ssl-config into master

  • Make Django interpret proxied requests as secure by setting SECURE_PROXY_SSL_HEADER.

  • Make Weblate generate URLs with https:// by setting ENABLE_HTTPS to True.

  • Make sure Django middleware will not attempt to redirect to HTTPS, as we do that in our proxy already.

  • Explicitely set CSRF_COOKIE_SECURE as True instead of make it depend on the value of another variable.

  • Add comments mentioning our proxied config for a couple of variables.

Edited by Zen Fu

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