Merge release back to master

patch release edx-submissions

patch release edx-submissions

Add advanced settings to generate_courses command

Add forums URL default for docker devstack

Upgrade edx-enterprise package to 0.39.7.

Revert "Add i18n to date in certificate web"

Strip `c` from `.pyc` for error message comparison

Fix attrib check code for library_content import

Attributes come in as a list of dicts with strings as keys and values.
Implicitly casting each result as a tuple causes the code to split the key string into it's characters.
This yields a list of characters, the first two of which are placed into the variables "attr_name" and "attr_value".
This is not only wrong, but because keys tend to be more than 2 characters, the net result is:

"ValueError: too many values to unpack"

Add i18n to date in certificate web

https://github.com/edx/edx-enterprise/compare/0.39.6...0.39.7

In Python 2.7, `__file__` returns `.pyc` by default, this breaks our
comparison so let's strip out the trailing `c`.

Upgrading edx-enterprise to 0.39.6.

https://github.com/edx/edx-enterprise/compare/0.39.5...0.39.6

ENT-555: Continue button is not appearing on registration page.

update django-debug-toolbar from 1.5 to 1.8

Fix LMS dashboard error, if HttpServerError occurs on ecommerce

LEARNER-2167

Throw error if celery task creation is not successfully completed.

Added new signal to refund on un-enrollment from LMS dashboard.

LEARNER-1801

length complexity added on password reset page

PROFILE_IMAGE_SIZES_MAP grouped with the similar settings

LEARNER-1492

ENT-581 Upgrade enterprise package to 0.39.5