Before proceed you must enable the translation workbench and add the supported  language. To enable the translation workbench go through  Translation Workbench In Salesforce.

–> Custom labels are simple text values  which is used by user to translate in any salesforce supported language.

–> It present the information in user native language.

–> It can be used in salesforce visualforce page by three ways.

1. In Visualforce Page
2. In Apex Class
3.  In JavaScript

Let’s see an example to use it.

Step 1: First create custom labels for the content. Goto||Setup||Create||Custom Labels.

Step 2: Create visualforce page and apex class to show the label as shown in below code.

# Visualforce Page Code

<apex:page language="de" controller="exampleCustomLabel">
<!--
/**
* Webkul Software.
*
* @category Webkul
* @author Webkul
* @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com)
* @license https://store.webkul.com/license.html
*/
-->

<!-- If your org has a name space $Label.namespace.labelName -->

<apex:form>
<p >
Render By Visualforce Page : {!$Label.German}
</p>
<p >
Render By Apex Class : {!cstmLabel}
</p>
</apex:form>
</apex:page>

# Apex Class :

public class exampleCustomLabel {
/**
* Webkul Software.
*
* @category Webkul
* @author Webkul
* @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com)
* @license https://store.webkul.com/license.html
*/

public String cstmLabel {get; set;}
public exampleCustomLabel () {
// If you have namespace use System.Label.your_namespace.label_name
// Here German is custom label name
cstmLabel = System.Label.German;
}
}