Merge feature SOL-20

This is a pull request to merge the SOL-20 feature (https://openedx.atlassian.net/browse/SOL-20).
Instead of class="label" we should be using a semantic  ```<label>``` element.  Wrap the text and input so we don't have to mess with unique IDs:
```<label><span class="label">Studio:</span> <input type="text" class="embeddable-xml-input" value="<%= portable_url %>" readonly></label>```