Assign language Value dynamically in Visualforce page

Question

I am trying to assign the language dynamically in a Visualforce page which I have specified in controller. Right now it is hard coded as

<apex:page language="de">
........
</apex:page>

Is it possible to achieve this via global variables?

<apex:page controller="controller_1" Language="{!code}" >
 <apex:form >
  <apex:inputTextarea value="{!test}"/>
 </apex:form>
</apex:page>

public class controller_1{
    public String test {get; set;}
    public String code {get; set;}

    public controller_1()
    { 
      code ='de';     
      Schema.DescribeFieldResult f = Schema.sObjectType.Lead.fields.Company;
      test = f.getLabel();
   }  
}

Answer 1

Yes, you can do that in your apex:page tag, by using the attribute language, then dynamically bind it to a value in your controller or extension:

<apex:page Controller="PageController" language="{!code}">

From the documentation: The language used to display labels that have associated translations in Salesforce. This value overrides the language of the user viewing the page. Possible values for this attribute include any language keys for languages supported by Salesforce, for example, "en" or "en-US".

http://www.salesforce.com/us/developer/docs/pages/Content/pages_compref_page.htm

Answer 2

This may not be the same issue/solution for others here's how I finally got this working on my end:

1) Language Code: Set (get) the language code value for each user emailed:

   NOTE: This step may vary for others but for me I store the language
   for each user in a custom field that is setup to return a 
   SFDC-friendly language code value like en_US, zh_CN, etc. 
   Reference: https://developer.salesforce.com/forums/?id=906F00000008o2ZIAQ 

2) MyEmail.email (Email component): Add language attribute:

   <messaging:emailTemplate subject="Test Subject" recipientType="Contact"
   relatedToType="MyObject__c" language="{!relatedTo.LanguageCode__c}">

3) MyEmail.cls (Apex Class/Controller): Update SOQL

   NOTE: Make sure the main SOQL pulls MyObject__c.LanguageCode__c value for
   the relatedTo() object

4) MyEmail.component (Visualforce email): Watch Custom Labels in auto-translate themselves

    NOTE: Any custom labels in this email that have 
    translations for the language code found for each 
    user/email will automatically use that translation.