Add title attribute for skins/modes hiding the actual button text

Conflicts:
	skins/larry/templates/messagepart.html

skins/larry/templates/messagepart.html

@@ -14,8 +14,8 @@
 
 <h2 id="aria-label-toolbar" class="voice"><roundcube:label name="arialabeltoolbar" /></h2>
 <div id="messagetoolbar" class="toolbar fullwidth" role="toolbar" aria-labelledby="aria-label-toolbar">
-	<roundcube:button command="download" type="link" class="button download disabled" classAct="button download" classSel="button download pressed" label="download" />
-	<roundcube:button command="print" type="link" class="button print disabled" classAct="button print" classSel="button print pressed" label="print" />
+	<roundcube:button command="download" type="link" class="button download disabled" classAct="button download" classSel="button download pressed" label="download" title="download" />
+	<roundcube:button command="print" type="link" class="button print disabled" classAct="button print" classSel="button print pressed" label="print" title="print" />
 	<roundcube:container name="toolbar" id="messagetoolbar" />
 </div>