<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
    <application>
        <locale-config>
            <default-locale>en</default-locale>
            <supported-locale>de</supported-locale>
        </locale-config>
        <resource-bundle>
            <base-name>org.bitbucket.paulstat.jsf.localisation.messages</base-name>
            <var>msgs</var>
        </resource-bundle>
    </application>
</faces-config>

main
|_ java
|_ resources
|  |_ org
|     |_ bitbucket
|        |_ paulstat
|           |_ jsf
|              |_ localisation
|                 |_ messages.properties
|_ webapp

greeting=Hello

greeting=Salut

<f:view locale="en">
   #{msgs.greeting}
</f:view>
<f:view locale="fr">
   #{msgs.greeting}
</f:view>

<f:view locale="en">
   <f:loadBundle baseName="x" var="msgs" />
   #{msgs.greeting}
</f:view>
<f:view locale="fr">
   <f:loadBundle baseName="x" var="msgs" />
   #{msgs.greeting}
</f:view>

**NB. If one tries to switch to a locale that's not listed in the supported locales the default will be used eg.**

<f:view locale="de">
   #{msgs.greeting}
</f:view>

The above in the case of the faces-config example defined on this page will use the default en locale

@Named
@SessionScoped
public class LocaleSwitcher implements Serializable {

    private String languageCode;

    public String switchLocale() {
        FacesContext.getCurrentInstance().getViewRoot().setLocale(new Locale(languageCode));
        return null;
    }

    public void setLanguageCode(String languageCode) {
        this.languageCode = languageCode;
    }

    public String getLanguageCode() {
        return languageCode;
    }

}

<h:body>

    #{msgs.fixedMessage}
    <h:form>
        <h:panelGrid columns="2">
            <h:commandButton immediate="true" value="English"
                action="#{localeSwitcher.switchLocale}">
                <f:setPropertyActionListener value="en"
                    target="#{localeSwitcher.languageCode}" />
            </h:commandButton>
            <h:commandButton immediate="true" value="German"
                action="#{localeSwitcher.switchLocale}">
                <f:setPropertyActionListener value="de"
                    target="#{localeSwitcher.languageCode}" />
            </h:commandButton>
        </h:panelGrid>
    </h:form>
</h:body>