Add en, ru, uk language.

src/speller2_worker.py

@@ -14,14 +14,17 @@ class Speller2Worker(nlp_ws.NLPWorker):
     def static_init(cls, config):
         """One time static initialisation."""
         _log.log(logging.INFO, "Worker started loading static models ")
-        cls._model = Speller('pl')
+        cls._model = {'pl': Speller('pl'),
+                      'ru': Speller('ru'),
+                      'en': Speller('en'),
+                      'uk': Speller('uk')}
         _log.log(logging.INFO, "Worker finished loading static models ")
 
     def process(self, input_file, task_options, output_file):
         """Starting nlp process."""
         _log.info("Processing")
-
-        model = self._model
+        language = task_options.get('lang', 'pl')
+        model = self._model.get(language)
 
         data = self._read_file(input_file)