Use non-ascii PLATFORM_NAME in tests.

It should help catch unicode encoding problems earlier.

This also updates python-saml dependency to a version that includes a
patch for unicode strings.

openedx/core/djangoapps/api_admin/widgets.py

@@ -29,7 +29,7 @@ class TermsOfServiceCheckboxInput(CheckboxInput):
             link_end='</a>',
         )
 
-        html = '<input{{}} /> <label class="tos-checkbox-label" for="{id}">{label}</label>'.format(
+        html = u'<input{{}} /> <label class="tos-checkbox-label" for="{id}">{label}</label>'.format(
             id=final_attrs['id'],
             label=label
         )