Helpers cannot be used for Select box information

[justinrowles]

At present, the 'helper' functionality is restricted to text box information.

The attached patch allows it to be used for select boxes too, and provides a sample implementation for gmd:language.

[justinrowles]

Here's an example of what goes in the labels.xml file to make that functionality appear:

<element name="codeListValue" context="gmd:language" id="39.0">

<helper>

<option value="eng">English</option> <option value="wel">Welsh</option>

</helper>

</element>