[extractor/common] Allow non-lang in subtitles' keys

See 264e77c406a3b14f15aafcd036524cb6fe86aa20

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 07d101aef8f1e4426ee26eaf36c307efe8b23bb9..6fa7c334ea9e7ebafbb7805768e55e4f43ca00df 100644 (file)
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -189,9 +189,10 @@ class InfoExtractor(object):
     uploader_url:   Full URL to a personal webpage of the video uploader.
     location:       Physical location where the video was filmed.
     subtitles:      The available subtitles as a dictionary in the format
-                    {language: subformats}. "subformats" is a list sorted from
-                    lower to higher preference, each element is a dictionary
-                    with the "ext" entry and one of:
+                    {tag: subformats}. "tag" is usually a language code, and
+                    "subformats" is a list sorted from lower to higher
+                    preference, each element is a dictionary with the "ext"
+                    entry and one of:
                         * "data": The subtitles file contents
                         * "url": A URL pointing to the subtitles file
                     "ext" will be calculated from URL if missing