1. Rearranged and renamed strings in '/res/values/strings.xml'
2. Fixed earlier problem with Android's Calendar Provider API crashing
in certain devices running ICS and higher: added try-catch blocks so as
to use the safer (yet dated and not considered to be best practice)
method of invoking the Calendar activity (the one used on preICS
devices)
3. Added exception handling for cases when Maps or Calendar were
uninstalled from the device. Otherwise the app would throw an
ActivityNotFound exception which would crash it.