Last fixes before pushing for bigger content update

Changelog

This version brings further improvement and more stability to the app. Besides less crashes this update holds:

• Logging of infos, warnings and errors
  The tool will create a folder './logs' with a 'log<current_date>.txt'. So from now on you can forward the log to me, when crashes occur so errors can be spotted faster.

• Framework for support of different languages
  The next update will utilize this to provide at least the languages czech and german besides english.