How to force language in Desired Capabilities - Appium - Java

Does anybody know how i can made my App to run in specific language e.g. : English, German,via
a line of code in Desired Capabilities.
I know in appium Gui you can set the flag to force it, that app run in a specific language, but i have some test that i want to be run in different language …see part of my code :

// Config and Setup a AppiumDriverInstance
public AppiumDriver driver;
public WebDriverWait wait;

public void setUp() throws Exception {
// set up appium for ios instance
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(MobileCapabilityType.DEVICE_NAME, “iPhone 5s”);
capabilities.setCapability(MobileCapabilityType.APP, “/Users/Shared/my/”);
// capabilities.setCapability(cap, “Mac”);
driver = new IOSDriver(new URL(“”), capabilities);
wait = new WebDriverWait(driver, 30);

which version of appium are you using?
i think this is only possible on simulators/emulators via the language/locale capabilities

i use Version 1.4.13 (Draco) ,
yes i run the test on simulator, i couldn’t find in the link you send something that i need,don’t have any example ?