(WIP) Fix studio errors with Unicode course location values

In the CMS, when opening a course that has an Arabic/Unicode value in it's components the exception bellow happens.
To fix it I've made the following:
 
 - Added Arabic course values by default to all courses
 - Fixed the issue by encoding the value before sending it to `urllib`

Todo
--
 - Make sure the test update actually detects the problem
 - Make sure to fix all the raised exceptions because of this test change

------
```
Nov  2 12:15:37 ip-172-31-7-111 [service_variant=cms][root][env:sandbox] ERROR [ip-172-31-7-111  19754] [exceptions.py:9] - Uncaught exception from <class 'django.core.handlers.wsgi.WSGIHandler'>
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 109, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 20, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/course.py", line 233, in course_handler
    return course_index(request, CourseKey.from_string(course_key_string))
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 20, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/decorators.py", line 91, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/course.py", line 436, in course_index
    course_structure = _course_outline_json(request, course_module)
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/course.py", line 272, in _course_outline_json
    include_children_predicate=lambda xblock: not xblock.category == 'vertical'
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/item.py", line 707, in create_xblock_info
    include_children_predicate=include_children_predicate,
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/item.py", line 891, in _create_xblock_child_info
    ) for child in xblock.get_children()
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/item.py", line 707, in create_xblock_info
    include_children_predicate=include_children_predicate,
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/item.py", line 891, in _create_xblock_child_info
    ) for child in xblock.get_children()
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/item.py", line 727, in create_xblock_info
    "studio_url": xblock_studio_url(xblock, parent_xblock),
  File "/edx/app/edxapp/edx-platform/cms/djangoapps/contentstore/views/helpers.py", line 107, in xblock_studio_url
    usage_key=urllib.quote(unicode(xblock.location))
  File "/usr/lib/python2.7/urllib.py", line 1268, in quote
    return ''.join(map(quoter, s))
KeyError: u'\u0625'
```