demos: Add examples of FieldLayout with very long labels
demos: Add examples of FieldLayout with very long labels

While obviously discouraged, it is something we support.
For example, moderately long labels can easily become very
long when translated from English to a different language.

Change-Id: I1d235ab84cdec3c3f54dbfd0ffc0d8c3793c39ac

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui