Use "MediaWiki" as one parameter and "r66069" as another parameter, otherwise:
In Chinese, "word-separator" is empty because no space is needed between two *Chinese* words. However neither "MediaWiki" nor "r66069" is Chinese, so finally the title renders "MediaWikir66069 - ..something.."
- regarding r66069: this is message "code-rev-id" and it's possible to translate it to something meaning "revision $1" -- although a little verbose -- in Chinese, to workaround this, but "code-rev-id" is tagged "Don't translate this message."
Version: unspecified
Severity: normal