Improve a couple of detection strings to avoid i18n-related bugs

youtube-dl

@@ -529,7 +529,7 @@ class YoutubeIE(InfoExtractor):
 		self.report_video_url(video_id, video_real_url)
 
 		# uploader
-		mobj = re.search(r'More From: ([^<]*)<', video_webpage)
+		mobj = re.search(r"var watchUsername = '([^']+)';", video_webpage)
 		if mobj is None:
 			self.to_stderr(u'ERROR: unable to extract uploader nickname')
 			return [None]
@@ -682,7 +682,7 @@ class YoutubePlaylistIE(InfoExtractor):
 	_VALID_URL = r'(?:http://)?(?:\w+\.)?youtube.com/view_play_list\?p=(.+)'
 	_TEMPLATE_URL = 'http://www.youtube.com/view_play_list?p=%s&page=%s'
 	_VIDEO_INDICATOR = r'/watch\?v=(.+?)&'
-	_MORE_PAGES_INDICATOR = r'class="pagerNotCurrent">Next</a>'
+	_MORE_PAGES_INDICATOR = r'/view_play_list?p=%s&amp;page=%s'
 	_youtube_ie = None
 
 	def __init__(self, youtube_ie, downloader=None):
@@ -727,7 +727,7 @@ class YoutubePlaylistIE(InfoExtractor):
 				ids_in_page.add(mobj.group(1))
 			video_ids.extend(list(ids_in_page))
 
-			if self._MORE_PAGES_INDICATOR not in page:
+			if (self._MORE_PAGES_INDICATOR % (playlist_id, pagenum + 1)) not in page:
 				break
 			pagenum = pagenum + 1