Fix incorrect "aria-role" attributes

Also, change the "tooltip" value for these attributes to "img" as a
better role for the icons here

(fix #2111)

application/view/common/resource-values.phtml

@@ -67,11 +67,11 @@ foreach ($values as $term => $propertyData):
             <?php endif; ?>
             <span class="value-content"><?php echo $filterLocale ? $value->asHtml($lang) : $value->asHtml(); ?></span>
             <?php if(!$value->isPublic()): ?>
-                <span class="o-icon-private" aria-role="tooltip" title="<?php echo $this->escapeHtml($translate('Private')); ?>" aria-label="<?php echo $this->escapeHtml($translate('Private')); ?>"></span>
+                <span class="o-icon-private" role="img" title="<?php echo $this->escapeHtml($translate('Private')); ?>" aria-label="<?php echo $this->escapeHtml($translate('Private')); ?>"></span>
             <?php endif; ?>
             <?php if ($valueAnnotation && $showValueAnnotations): ?>
                 <a href="#" class="<?php echo ('expanded' === $showValueAnnotations) ? 'collapse' : 'expand'; ?>" aria-label="<?php echo ('expanded' === $showValueAnnotations) ? $this->escapeHtml($translate('Collapse')) : $this->escapeHtml($translate('Expand')); ?>">
-                    <span class="has-annotation o-icon-annotation" aria-role="tooltip" title="<?php echo $this->escapeHtml($translate('Has annotation')); ?>" aria-label="<?php echo $this->escapeHtml($translate('Has annotation')); ?>"></span>
+                    <span class="has-annotation o-icon-annotation" role="img" title="<?php echo $this->escapeHtml($translate('Has annotation')); ?>" aria-label="<?php echo $this->escapeHtml($translate('Has annotation')); ?>"></span>
                 </a>
                 <div class="collapsible annotation">
                     <?php echo $valueAnnotation->displayValues(); ?>