LPS-35920 Added new  method to determine whether a key is exists for the specified Locale or not
LPS-35920 Add p_auth token check and no-cache for unknown keys
LPS-35920 Cached p_auth records should have only one cache entry, accessible only with the valid token
LPS-35920 Added p_auth to Liferay.Language.get() calls to make it consistent with LanguageServlet
Merge pull request #30 from topolik/LPS-35920

LPS-35920_