Add label to select to meet WCAG 2.0 AA

Hello,

There is no label associated to the select list in either the "Both" or the "Dropdown" instances. Please add the following to make this WCAG Level AA compliant.

 $block_content .= '<label for="languages">Translate</label>'; // New line to assign label, easily hidden with CSS
 $block_content .= '<select id="languages" onchange="doGTranslate(this);">'; // ID added