l
String l(String key);
i.e., org.zkoss.xel.fn.CommonFns#getLabel(java.lang.String)
Returns the label of the given key defined in the internationalization labels.
The label is based on the current Locale (org.zkoss.util.Locales#getCurrent()).
For 5.0.7 and later, an implicit object called labels was introduced, and it is more convenient to use.
For example,
<?taglib uri="http://www.zkoss.org/dsp/web/core" prefix="c"?>
<window title="${c:l('app.title')}">
...
</window>