reported default locale of the device.</p>
<p>This establishes the language and formatting conventions that application
should, if possible, use to render their user interface.</p>
<p>This is the first locale selected by the user and is the user's
primary locale (the locale the device UI is displayed in)</p>
<p>This is equivalent to <code>locales.first</code> and will provide an empty non-null locale
if the <a href="dart-ui/Window/locales.html">locales</a> list has not been set or is empty.</p>
        </se