Allow multi-lingual text to be placed inline in the form instead of in <itext>

[droos]

We can currently support multi-lingual text and multiple text forms ('short', 'long', etc.) through the <itext> tag in the model.

Would be nice to also support this inline in the form, so that the text is close to the place it is used, rather than having a bunch of <ref>s.

Note: I'm saying support this in addition to <itext>, not get rid of <itext>

Example:

<input bind="blah">
<label lang="English" form="long">What is your name?</label>
<label lang="English" form="short">Name</label>
<label lang="Spanish" form="long">¿Como te llamas?</label>
<label lang="Spanish" form="short">Nombre</label>
</input>