Fix non-translatable strings
Initial ViewPager support (WIP)

Support for tab-swiping using a ViewPager
Transitioned tabs from Activities to Fragments (from the support library)
Removed intent passing to tabs as they are now fragments
Fix typo in drawable name
MyTabListener: ViewPager tab listener class
CardsFragment: Refactoring and restructuring
Some other general code cleanup and improvements, including try-catch
 optimisations.

TODO: Refresh is currently broken (does nothing).