[TASK] Hide the asterisk symbol for required fields with aria-hidden …

…for assistive technologies

Related: #962

Resources/Private/Partials/Form/FieldLabel.html

@@ -6,6 +6,6 @@
 
 <f:if condition="{field.css} != 'nolabel'">
     <label for="powermail_field_{field.marker}" class="{settings.styles.framework.labelClasses}" title="{field.description}">
-        <vh:string.escapeLabels>{field.title}</vh:string.escapeLabels><f:if condition="{field.mandatory}"><span class="mandatory">*</span></f:if>
+        <vh:string.escapeLabels>{field.title}</vh:string.escapeLabels><f:if condition="{field.mandatory}"><span class="mandatory" aria-hidden="true">*</span></f:if>
     </label>
 </f:if>