Solution for bensullivan

groovy_selenium_demo.groovy

import org.openqa.selenium.By
import org.openqa.selenium.StaleElementReferenceException
import org.openqa.selenium.WebDriver
import org.openqa.selenium.WebElement
import org.openqa.selenium.firefox.FirefoxDriver
import org.openqa.selenium.support.ui.ExpectedCondition
import org.openqa.selenium.support.ui.WebDriverWait

import static org.openqa.selenium.support.ui.ExpectedConditions.elementToBeClickable
import static org.openqa.selenium.support.ui.ExpectedConditions.findElement

def browser = new FirefoxDriver()
browser.manage().window().maximize()
browser.get('http://translate.google.com/')
def wait = new WebDriverWait(browser, 10)

def languageButton = browser.findElementById('gt-sl-gms')
languageButton.click()
def norwegianLanguageLinkLocator = By.xpath("//div[text()='Norwegian']")
wait.until(elementToBeClickable(norwegianLanguageLinkLocator)).click()

println languageButton.text

browser.findElementById('source').sendKeys('ost')

def resultTextBoxLocator = By.cssSelector('#result_box span')
def result_box = wait.until(textToBePopulatedInElement(resultTextBoxLocator))
println "Result text: \"${result_box.text}\""

browser.quit()

public static ExpectedCondition<WebElement> textToBePopulatedInElement(
        final By locator) {

    return new ExpectedCondition<WebElement>() {
        @Override
        public WebElement apply(WebDriver driver) {
            try {
                WebElement element = findElement(locator, driver)
                if (!element.getText().empty) {
                    return element
                }
            } catch (StaleElementReferenceException ignored) {
                return null;
            }
        }
    };
}