Initializes the app object. Important: this should be done immediately after including the app library for consistent results.
Overloads if your application wants to handle error specifically.
Indicates the language file to use if the app does not have a language file for the phone's chosen language. For example, if the chosen language/locale is fr_fr, but the app does not include the file strings.fr_fr.js, then the app uses the default language file as indicated with this parameter. If no value has been defined, the phone tries to use en_us.