Finished initialization.

  - All initialization is now done.
    - Basic init for properties file.
    - I18N init for internationalisation.
    - Logging init for logging purposes.
  - Added a basic logging configuration.
  - Added a basic language file.
  - Added an internationalization helper.
    - All internationalized string should be surounded with t("").
  - Made progessbar work.
  - Made application switch to MainWindow.