Adding roles to the datepicker templates to resolve an ADA violation. (#6170)

Closes #6170

Author: david-kirkland

template/datepicker/day.html

@@ -11,7 +11,7 @@
     </tr>
   </thead>
   <tbody>
-    <tr class="uib-weeks" ng-repeat="row in rows track by $index">
+    <tr class="uib-weeks" ng-repeat="row in rows track by $index" role="row">
       <td ng-if="showWeeks" class="text-center h6"><em>{{ weekNumbers[$index] }}</em></td>
       <td ng-repeat="dt in row" class="uib-day text-center" role="gridcell"
         id="{{::dt.uid}}"

template/datepicker/month.html

@@ -7,7 +7,7 @@
     </tr>
   </thead>
   <tbody>
-    <tr class="uib-months" ng-repeat="row in rows track by $index">
+    <tr class="uib-months" ng-repeat="row in rows track by $index" role="row">
       <td ng-repeat="dt in row" class="uib-month text-center" role="gridcell"
         id="{{::dt.uid}}"
         ng-class="::dt.customClass">

template/datepicker/year.html

@@ -7,7 +7,7 @@
     </tr>
   </thead>
   <tbody>
-    <tr class="uib-years" ng-repeat="row in rows track by $index">
+    <tr class="uib-years" ng-repeat="row in rows track by $index" role="row">
       <td ng-repeat="dt in row" class="uib-year text-center" role="gridcell"
         id="{{::dt.uid}}"
         ng-class="::dt.customClass">