Removed duplicated aria-hidden attributes in slideshow.tpl

And in navigation.tpl

behatnotneeded

Change-Id: Ib60cebe519810b93d504b38bf138bcb15306d340

htdocs/theme/raw/plugintype/artefact/file/blocktype/gallery/templates/slideshow.tpl

@@ -18,23 +18,23 @@
 
         <div class="left carousel-control">
             <a class="carousel-control-prev" href="#slideshow{$instanceid}" role="button" data-slide="prev" title="{str tag=previous}">
-                <span class="icon icon-angle-left icon-lg" role="presentation" aria-hidden="true" aria-hidden="true"></span>
+                <span class="icon icon-angle-left icon-lg" role="presentation" aria-hidden="true"></span>
                 <span class="sr-only">{str tag=previous}</span>
             </a>
 
             <a class="carousel-control-first" href="#slideshow{$instanceid}" role="button" data-slide-to="0" title="{str tag=first}">
-                <span class="icon icon-angle-double-left icon-lg" role="presentation" aria-hidden="true" aria-hidden="true"></span>
+                <span class="icon icon-angle-double-left icon-lg" role="presentation" aria-hidden="true"></span>
                 <span class="sr-only">{str tag=first}</span>
             </a>
         </div>
 
         <div class="right carousel-control">
             <a class="carousel-control-next" href="#slideshow{$instanceid}" role="button" data-slide="next" title="{str tag=next}">
-                <span class="icon icon-angle-right icon-lg" role="presentation" aria-hidden="true" aria-hidden="true"></span>
+                <span class="icon icon-angle-right icon-lg" role="presentation" aria-hidden="true"></span>
                 <span class="sr-only">{str tag=next}</span>
             </a>
             <a class="carousel-control-last" href="#slideshow{$instanceid}" role="button" data-slide-to="{$k}" title="{str tag=last}">
-                <span class="icon icon-angle-double-right icon-lg" role="presentation" aria-hidden="true" aria-hidden="true"></span>
+                <span class="icon icon-angle-double-right icon-lg" role="presentation" aria-hidden="true"></span>
                 <span class="sr-only">{str tag=last}</span>
             </a>
         </div>

htdocs/theme/raw/templates/header/navigation.tpl

@@ -12,7 +12,7 @@
                     {/if}
 
                     {if $item.accessibletitle}
-                    <span aria-hidden="true" role="presentation" aria-hidden="true">
+                    <span role="presentation" aria-hidden="true">
                         {/if}
                         {$item.title}
                         {if $item.accessibletitle}