Fix DiscussionTabMultipleThreadTest color-contrast issues - TNL-4639

common/test/acceptance/tests/discussion/test_discussion.py

@@ -457,7 +457,6 @@ class DiscussionTabMultipleThreadTest(BaseDiscussionTestCase):
         self.thread_page_1.a11y_audit.config.set_rules({
             "ignore": [
                 'section',  # TODO: AC-491
-                'color-contrast',  # TNL-4639
                 'icon-aria-hidden',  # TNL-4641
             ]
         })
@@ -1333,7 +1332,6 @@ class DiscussionSearchAlertTest(UniqueCourseTest):
         self.page.a11y_audit.config.set_rules({
             'ignore': [
                 'section',  # TODO: AC-491
-                'color-contrast',  # TNL-4639
                 'icon-aria-hidden',  # TNL-4641
             ]
         })

lms/static/sass/discussion/_mixins.scss

@@ -61,7 +61,7 @@
   @include padding-left($baseline/4);
   padding-top: 3px;
   width: 100%;
-  color: $gray-l2;
+  color: $gray-d2;
   font-size: $forum-small-font-size;
 }