Changes related to Polish language

- Removed word 'jezyk', which means 'language' in English.
  Now it looks more natural and fits to naming convention).
  There is no 'English language' but simple 'English' or 'Français'.
  Polish language name should apply to that convention.

- Added Polish characters to Polish states names.
  Previously used names used Latin alphabet, where Polish characters were replaced.
  Changed Polish states order (sorted alphabetically).