Duplicates the value in the cell for the aria label.

This is a temporary fix until we add a key to the table and switch to using aria-describedby

analytics_dashboard/static/apps/learners/roster/views/spec/roster-spec.js

@@ -197,15 +197,15 @@ define(function (require) {
 
             expect($tr.children('td.discussion_contributions'))
                 .toHaveClass('learner-cell-rank-bottom');
-            expect($tr.children('td.discussion_contributions ')).toHaveAttr('aria-label', 'low');
+            expect($tr.children('td.discussion_contributions ')).toHaveAttr('aria-label', '10 low');
             expect($tr.find('td.problems_completed'))
                 .toHaveClass('learner-cell-rank-middle');
             expect($tr.find('td.problems_attempted'))
                 .toHaveClass('learner-cell-rank-top');
-            expect($tr.find('td.problems_attempted')).toHaveAttr('aria-label', 'high');
+            expect($tr.find('td.problems_attempted')).toHaveAttr('aria-label', '100 high');
             expect($tr.find('td.problem_attempts_per_completed'))
                 .toHaveClass('learner-cell-rank-top');
-            expect($tr.find('td.problem_attempts_per_completed')).toHaveAttr('aria-label', 'high');
+            expect($tr.find('td.problem_attempts_per_completed')).toHaveAttr('aria-label', '1.56 high');
             expect($tr.find('td.videos_viewed'))
                 .toHaveClass('learner-cell-rank-middle');
         });

analytics_dashboard/static/apps/learners/roster/views/table.js

@@ -57,9 +57,9 @@ define(function (require) {
                 if (engagementCategory) {
                     this.$el.addClass(this.enagementCategoryToClass[engagementCategory]);
                     if (engagementCategory === 'classRankTop') {
-                        this.$el.attr('aria-label', 'high');
+                        this.$el.attr('aria-label', value + ' high');
                     } else if (engagementCategory === 'classRankBottom') {
-                        this.$el.attr('aria-label', 'low');
+                        this.$el.attr('aria-label', value + ' low');
                     }
                 }
                 return Backgrid.Cell.prototype.render.apply(this, arguments);