About [[MediaWiki:Comments-reply-to/en]]

This is somewhat trickier to do than what it looks like, I'd say.

The function in question is reply (of the Comment class) in /extensions/Comments/Comment.js (lines 246-258). This message is followed by not only the name of the person whom you're replying to (the poster variable), but also a space followed by the "cancel reply" (MediaWiki:Comments-cancel-reply) message inside parentheses.

As always, patches or other info on how to solve this issue properly are very much welcome. :)