title: Zend drop down menu title wont be translated
body: <p>I have a field county:</p>
  
  <pre><code>    $county = new Select('county');
      $county-&gt;setAttribute('id', 'county');
      $county-&gt;setAttribute('class', 'stored');
      $county-&gt;setAttribute('title', _('web.form.selfService.register.county.title'));
      $county-&gt;setAttribute('required', 'required');
      $county-&gt;setEmptyOption(_('web.form.selfService.register.county.emptyOption'));
      $county-&gt;setValueOptions($this-&gt;getDomainValues(Domain::COUNTY));
      $county-&gt;setLabel(_('web.form.selfService.register.county.label'));
      $this-&gt;add($county);
  </code></pre>
  
  <p>When the county field is left empty and form is submitted the output is the source text: <strong>web.form.selfService.register.county.title</strong></p>
  
  <p>Also I have many text fields in the form and their titles are translated fine. <br>Example:</p>
  
  <pre><code>    $firstName = new Text('firstName');
      $firstName-&gt;setAttribute('id', 'firstName');
      $firstName-&gt;setAttribute('class', 'stored');
      $firstName-&gt;setAttribute('placeholder', _('web.form.selfService.register.firstName.placeholder'));
      $firstName-&gt;setAttribute('title', _('web.form.selfService.register.firstName.title'));
      $firstName-&gt;setAttribute('required', 'required');
      $firstName-&gt;setLabel(_('web.form.selfService.register.firstName.label'));
      $this-&gt;add($firstName);
  </code></pre>
  
  <p>and when first name field is left empty and the form is submitted the output will be:<br>
  <strong>Please insert first name</strong></p>