Invoking specific locale in gwt application

To invoke a specific locale from a gwt application using the URL,

add the get parameter locale=<string> where

string is the locale defined in your module file.  

for example:

http://localhost:8080/broadleafdemo/admin.html?locale=es_MX

Make sure your gwt module xml file contains the language you are trying to set.

<?xml version="1.0" encoding="UTF-8"?>

<module>

    <inherits name="com.google.gwt.user.User" />

    <inherits name="org.broadleafcommerce.openadmin.userModule" />

    <inherits name="com.google.gwt.core.CompilerParameters"/>

    <inherits name="com.google.gwt.i18n.I18N"/>

    <extend-property name="locale" values="en_US"/>

    <extend-property name="locale" values="es"/>

    <extend-property name="locale" values="es_MX"/>

    <extend-property name="locale" values="fr"/>

    <set-property-fallback name="locale" value="en_US"/>

<entry-point class="org.broadleafcommerce.openadmin.client.BLCLaunch" />

</module>

Got to https://developers.google.com/web-toolkit/doc/latest/DevGuideI18nLocale for more details.