v2.6.1: bug fixes to support python 3.6 again

Author: jxmorris12

language_tool_python/language_tag.py

@@ -22,7 +22,7 @@ def __str__(self):
         return self.normalized_tag
 
     def __repr__(self):
-        return f'<LanguageTag "{str(self)}">'
+        return '<LanguageTag "{}">'.format(str(self))
 
     def _normalize(self, tag):
         if not tag:

language_tool_python/server.py

@@ -207,7 +207,7 @@ def _query_server(self, url, params=None, num_tries=2):
                     try:
                         return response.json()
                     except json.decoder.JSONDecodeError as e:
-                        print(f'URL {url} and params {params} returned invalid JSON response:')
+                        print('URL {} and params {} returned invalid JSON response:'.format(url, params))
                         print(response)
                         print(response.content)
                         raise e