Oder hier rein:
case "price": {
$STRING .= '<div class="input-group col-md-4">
<input type="text" name="'.$formType.'['.$field['name'].']" maxlength="255" id="form_'.$field['name'].'" class="'.$field['class'].'" tabindex="'.$GLOBALS['TABORDER'].'" value="'.$FIELDVALUE.'" '.$EXTRA.'/>
<span class="input-group-addon">'.$GLOBALS['CORE_THEME']['currency']['symbol'].'</span></div> ';