WIP - added prototype for visually hidden descriptive spans

Story https://www.pivotaltracker.com/story/show/82381722 
Extend the labelling form header to add screen reader help text.
This code will do that, but we need to know where to place the additional data 
e.g. should there be a visually hidden span inside the label, inside the div or somewhere else
`<div class='form-group title hide js-claimanttype individual'>`
`<label for="claim_claimant_1_title">`
`<span class='visuallyhidden'>Claimant 1</span> Title</label>`  **Would this be read as Claimant 1 title?**
`<input class="narrow" id="claim_claimant_1_title" maxlength="8" name="claim[claimant_1][title]" size="8" type="text" />`
`</div>`


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