code: protected function get($locale, $file, $key)
  	{
  		// load it
  		$this->load($locale, $file);
  
  		if (array_key_exists($key, $this->translations[$locale][$file]) === false)
  		{
  			throw new TranslationKeyNotFound($key, $this->getPath(), $locale, $file);
  		}
  
  		$result = $this->translations[$locale][$file][$key];
  
  		if (is_string($result) === false)
  		{
  			throw new TranslationKeyIsNotAString($result, $key, $this->getPath(), $locale, $file);
  		}
  
  		return $result;
  	}
docs: retrieves a translation key from file for a locale
  
  @param string $locale
  @param string $file
  @param string $key
  @return string
  @throws TranslationKeyNotFound
  @throws TranslationKeyIsNotAString