glyphicons

Hi.
I’m trying to find a way to add glyphicons to my forms.
I found “input_before”, but it doesn’t accept html tags.
Is there any chance you could add suport for glyphicons?

if I just put my form manually(see example below) the form always validates even when nothing was entered to the field.

example:

<br />
'<br />
<div class="input-group"><br />
  <span class="input-group-addon wpcf7-form-control wpcf7-text wpcf7-validates-as-required glyphicon glyphicon-user" aria-hidden="true"></span><br />
  <input type="text" class="form-control" name="your-name" placeholder="Name"><br />
</div><br />
'<br />

https://wordpress.org/plugins/bootstrap-for-contact-form-7/