[MCKIN-7023] Ensures that default template tags are loaded for Django 1.11

[pomegranited]

Fixes bug related to the Django 1.11 upgrade and support for translations in XBlock templates added by #48.

Ensures that the standard Django templatetag libraries continue to work in XBlock templates (e.g., DnDv2 uses l10n).

JIRA tickets: MCKIN-7023, OSPR

Discussions: WL-230, YONK-879

Screenshots:

Before
Before this fix and since edx-platform was upgraded to Django 1.11, attempts to edit the DnDv2 XBlock in Studio resulted in this error:

After this change, DnDv2 XBlock can be edited as expected:

Sandbox URL: (provisioning)

• LMS: https://pr17670.sandbox.opencraft.hosting/
• Studio: https://studio-pr17670.sandbox.opencraft.hosting/

Merge deadline: ASAP

Testing instructions:

1. In Studio, create a course and add a Drag and Drop problem (e.g. sandbox Drag and Drop)
2. Edit the DnDv2 XBlock.
   Note that this works as expected.

Reviewers

• @mtyaka
• edx-solutions reviewer[s] TBD

CC @macdiesel

[mtyaka]

Thanks for catching and fixing this @pomegranited!

👍

• I tested this: Verified that with this patch installed editing the problem in the studio works as expected.
• I read through the code
• I checked for accessibility issues
• Includes documentation n/a

[pomegranited]

@mduboseedx FYI, this is ready for review. It's blocking openedx/xblock-drag-and-drop-v2#154 and https://github.com/edx/edx-platform/pull/17670, so we'd really appreciate it if you could help us get it merged.

[mduboseedx]

@pomegranited This actually should not have opened an OSPR (something to figure out with our bot), but I'll check in with Brian to hopefully get this reviewed.

@macdiesel Could this be looked at soon? It is blocking two other McKinsey PRs.

[pomegranited]

Thank you for your help @mduboseedx !

[macdiesel]

Thank you for this PR!

[pomegranited]

@macdiesel Thank you for getting on this so quickly!

Pushed tag v1.1.1.

[openedx-webhooks]

Although this pull request is already merged, I've created OSPR-5499 so that we can track it in Jira.

There is nothing you have to do. No action is needed from your side. Thanks again for your contribution.