[1.8.x] Fixed a few uses of Template that relied on a default engine.

Refs #24389.

Backport of 556a748 from master

django/core/management/templates.py

@@ -13,7 +13,7 @@ from os import path
 import django
 from django.core.management.base import BaseCommand, CommandError
 from django.core.management.utils import handle_extensions
-from django.template import Context, Template
+from django.template import Context, Engine
 from django.utils import archive
 from django.utils._os import rmtree_errorhandler
 from django.utils.six.moves.urllib.request import urlretrieve
@@ -148,7 +148,7 @@ class TemplateCommand(BaseCommand):
                     content = template_file.read()
                 if filename.endswith(extensions) or filename in extra_files:
                     content = content.decode('utf-8')
-                    template = Template(content)
+                    template = Engine().from_string(content)
                     content = template.render(context)
                     content = content.encode('utf-8')
                 with open(new_path, 'wb') as new_file:

django/views/i18n.py

@@ -6,7 +6,7 @@ import os
 from django import http
 from django.apps import apps
 from django.conf import settings
-from django.template import Context, Template
+from django.template import Context, Engine
 from django.utils import six
 from django.utils._os import upath
 from django.utils.encoding import smart_text
@@ -178,7 +178,7 @@ js_catalog_template = r"""
 
 
 def render_javascript_catalog(catalog=None, plural=None):
-    template = Template(js_catalog_template)
+    template = Engine().from_string(js_catalog_template)
     indent = lambda s: s.replace('\n', '\n  ')
     context = Context({
         'catalog_str': indent(json.dumps(

django/views/static.py

@@ -14,7 +14,7 @@ from django.http import (
     FileResponse, Http404, HttpResponse, HttpResponseNotModified,
     HttpResponseRedirect,
 )
-from django.template import Context, Template, TemplateDoesNotExist, loader
+from django.template import Context, Engine, TemplateDoesNotExist, loader
 from django.utils.http import http_date, parse_http_date
 from django.utils.six.moves.urllib.parse import unquote
 from django.utils.translation import ugettext as _, ugettext_lazy
@@ -102,10 +102,12 @@ template_translatable = ugettext_lazy("Index of %(directory)s")
 
 def directory_index(path, fullpath):
     try:
-        t = loader.select_template(['static/directory_index.html',
+        t = loader.select_template([
-                'static/directory_index'])
+            'static/directory_index.html',
+            'static/directory_index',
+        ])
     except TemplateDoesNotExist:
-        t = Template(DEFAULT_DIRECTORY_INDEX_TEMPLATE, name='Default directory index template')
+        t = Engine().from_string(DEFAULT_DIRECTORY_INDEX_TEMPLATE)
     files = []
     for f in os.listdir(fullpath):
         if not f.startswith('.'):