chore(*): Add lang example in elements

Author: skrustev

projects/igniteui-angular-elements/src/index.html

@@ -80,7 +80,7 @@ <h3 class="ig-typography__h6">Standalone paginator</h3>
     <igc-paginator per-page="25" total-records="150"></igc-paginator>
   </section>
 
-  <section>
+  <section lang="bg">
       <h3 class="ig-typography__h6">Flat Grid (MRL column layout)</h3>
       <igc-grid id="grid2" moving="true" paging="true" primary-key="ProductID" row-editable="true" allow-filtering="true" filter-mode="excelStyleFilter" display-density="compact">
         <igc-grid-toolbar>