title: symfony2 suddenly stricter on form labels
body: <p>So, in the horribly long list of issues following a symfony2 update from 2.0 up to 2.3, my form labels suddenly throw errors when they contain the swedish characters åäö, or spaces. </p>
  
  <p>This is no longer allowed:</p>
  
  <pre><code>    $builder
          -&gt;add('email', 'email', array('label' =&gt; 'Epost '))
          -&gt;add('plainPassword', 'repeated', array('type' =&gt; 'password', 'first_name' =&gt; 'Nytt lösenord ', 'second_name' =&gt; 'Upprepa lösenord ',));
  </code></pre>
  
  <p>This works though:</p>
  
  <pre><code>    $builder
          -&gt;add('email', 'email', array('label' =&gt; 'Epost '))
          -&gt;add('plainPassword', 'repeated', array('type' =&gt; 'password', 'first_name' =&gt; 'Nytt_losenord', 'second_name' =&gt; 'Upprepa_losenord',));
  </code></pre>
  
  <p>That is of course unacceptable from a graphic design point of view, so is my only option now to specify each form field separatly in a twig template, just because åäö is no longer allowed as a label?</p>