added missing Java API page link

Author: simotripo

src/site/site_es.xml

@@ -55,6 +55,7 @@
         <item name="Directory Structure" href="java-api.html#directoryStructure" />
         <item name="SqlSessions" href="java-api.html#sqlSessions" />
       </item>
+      <item name="Java API" ref="java-api.xml"/>
       <item name="Builders de sentencias" href="statement-builders.html" collapse="true">
         <item name="SelectBuilder" href="statement-builders.html#SelectBuilder" />
         <item name="SqlBuilder" href="statement-builders.html#SqlBuilder" />