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Reports the following <code>MessageFormat</code> problems in property values:

<p><b>Unknown format types</b>
<p>
  <code>MessageFormat</code> supports only these format types:
<ul>
  <li>number</li>
  <li>date</li>
  <li>time</li>
  <li>choice</li>
</ul>
  Other format types will be reported.

<p><b>Unpaired quotes</b>
<pre><code>
  property.key=Shouldn't happen: {0}
</code></pre>
<p>
  A single quote is interpreted as an escape until the end of the property, and will not be present in the re