LPS-35920 Added new init filter params
LPS-35920 Implemented forced check for AuthToken based on filter params
LPS-35920 Added new  method to determine whether a key is exists for the specified Locale or not
LPS-35920 Added extra logic to LanguageServlet to validate Locale and language key from URL
LPS-35920 Added p_auth to Liferay.Language.get() calls to make it consistent with LanguageServlet