[sites:youtube] Fix issue with Top/Live chat continuations in differe…

…nt languages (#75)

chat_downloader/sites/youtube.py

@@ -999,7 +999,7 @@ def _get_initial_video_info(self, video_id):
 
     def _get_chat_messages(self, initial_info, params):
 
-        initial_continuation_info = initial_info.get('continuation_info')
+        initial_continuation_info = initial_info.get('continuation_info') or {}
 
         # stream_start_time = initial_info.get('start_time')
         is_live = initial_info.get('is_live')
@@ -1013,18 +1013,22 @@ def _get_chat_messages(self, initial_info, params):
         # Top chat replay - Some messages, such as potential spam, may not be visible
         # Live chat replay - All messages are visible
         chat_type = params.get('chat_type').title()  # Live or Top
-        continuation_title = '{} chat'.format(chat_type)
+
+        continuation_values = list(initial_continuation_info.values())
+        continuation_keys = list(initial_continuation_info.keys())
+        if len(continuation_values) < 2:
+            raise NoContinuation(
+                'Initial continuation information could not be found.'.format(initial_continuation_info))
+
+        continuation_index = 0 if chat_type == 'Top' else 1
+        continuation = continuation_values[continuation_index]
+        log('debug', 'Getting {} chat ({}).'.format(
+            chat_type, continuation_keys[continuation_index]))
 
         api_type = 'live_chat'
         if not is_live:
-            continuation_title += ' replay'
             api_type += '_replay'
 
-        continuation = initial_continuation_info.get(continuation_title)
-        if not continuation:
-            raise NoContinuation(
-                'Initial continuation information could not be found for {}.'.format(continuation_title))
-
         init_page = self._YOUTUBE_INIT_API_TEMPLATE.format(
             api_type, continuation)
         # must run to get first few messages, otherwise might miss some