Update studio-frontend to 0.6.0

Verify 'Full Name' field does not allow HTML in Signup form

raise zendesk_proxy rate limit

Implement journeys app banner.

'Full Name' field in the signup form is allowing HTML as an input
which makes spoofing easily.To avoid it, validation is added
that will ensure 'Full Name' field does not allow HTML.

LEARNER-3385

Banners will enable the deep linking functionality for
mobile apps.

LEARNER-2731

Update account settings page for enterprise learners

ENT-762

update edx-organizations version to 0.4.9

Allow users to fulfill entitlements and change enrollments from the course dashboard.

Schedules: Fix hold back error

Fix video transcript model import before Django initialization occurs.

Also add try/except that prevents enroll failure caused by Schedule creation
exception in the future.

Address PR comments

Split one-line docstrings on their own line

Add period to the end of docstring summaries

Use kwargs.get to be more defensive

Disable pylint unused-argument about sender param

The user can now enroll in a session, unenroll from a session or change session
from a new course enrollment card on the course dashboard.

Aj/entitlement session backend

Lower pylint threshold to just above what it is on master

EDUCATOR-1577: Removed roll-out flags. 

[LEARNER-3136]

This commit containts the logic and API endpoint for a user to Enroll,
Unenroll, and switch-session on a Course Entitlement.

Don't use the edx-platform revision as the studio assets base url

PLAT-1372 Remove dead templates copying old admin HTML

updated translations