Here it is. As I wrote above "Why I have to pass some parameter "slovak" when I wan to read stop-words from file? This should be split into 2 function: 
* `get_stop_words(language)` - old one was fine I think
* `read_stop_words(stream)` - this can be generic if parameter `stream` is string it will behave to it like it is path to file otherwise just call `read()` method and than `close()`. Pattern than you can see in decorator [closing](https://docs.python.org/3.4/library/contextlib.html?highlight=closing#contextlib.closing) should be used.