[SalesForce] Localization for guest users

You can add to your page a url parameter called lang. Let's say your page is in german and english. your url will look like this: mySite.com/form?lang=de mySite.com/form?lang=en_us

On your visual force page you can add a parameter to your page tage called "language".

eg.

<apex:page language="{!$Currentpage.parameters.lang}">
    {!$Label.myTestLabel}
</apex:page>

You could use the language attribute of the VF page:

<apex:page language="es">
    <apex:outputText value="{!$Label.Foo}">

    <apex:pageBlock>
        <apex:pageBlockSection>
            <apex:outputField value="{!Account.BillingStreet}"/>
        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:page>

The label Foo and the fieldlabel for the Billing Street are in spanish then. Of course you must provide a spanish translation for the custom label.

The language attribute does accept ISO country codes plus an optional locale like

• en
• en_US
• de
• de_DE

You may also refer to a variable in order to set the locale dynamically:

<apex:page language="{!lang}">

This should allow you to write a VF page only once and use the platform specific translation mechanisms to translate all texts and labels.