**Steps to replicate the issue**
* Upload a video file to Commons that contains a special character (?,%,&)
* Visit the File page (or otherwise invoke the video player)
* Click the CC (Closed Captions) icon to pull up the menu
* Select "create captions"
* A new window/tab will open for TimedText
* The message "There is no video associated with the current subtitle page." appears instead of the interface to add captions
Example: https://meta.wikimedia.org/wiki/File:Does_the_content_on_Wikipedia_reflect_the_world’s_diversity%3F_–_A_WIKI_MINUTE.webm
**What happens?**:
Since the file name contains a character that is escaped, such as a question mark, that is escaped to "%3F". MediaWiki sees that as a differently named file (or the link is just broken in transit) and does not load the correct URL.
**What should have happened instead?**:
The menu item should link to the escaped version of the URL.
This should load: https://commons.wikimedia.org/wiki/TimedText:Does_the_content_on_Wikipedia_reflect_the_world’s_diversity%3F_–_A_WIKI_MINUTE.webm
Not this: https://commons.wikimedia.org/wiki/TimedText:Does_the_content_on_Wikipedia_reflect_the_world’s_diversity?_–_A_WIKI_MINUTE.webm