Add ema:note:date value to the template

[TristanCacqueray]

This change enables displaying the note date.

[srid]

Is it not already possible to do this with <ema:metadata>?

See #131 (comment)

[TristanCacqueray]

Unfortunately that doesn't work, it seems like there is a bug for this template. The HTML does get rendered, but the text content is empty.

[TristanCacqueray]

Alright, I thought the value would be printed when using <value var="date">, but that just set the tag value, so I needed to actually use the tag:

<!-- Create a new tag -->
<bind tag="date"><ema:metadata><value var="date" /></ema:metadata></bind>
<!-- Show the date -->
<date />