The message livetranslate-translate-to lacks a placeholder ($1) for the target language of the translation. It is not really feasible to make a phrase to which a language name could be appended giving a valid sentence in many languages.
See also: http://www.mediawiki.org/wiki/Localisation#Avoid_patchwork_messages
http://translatewiki.net/w/i.php?title=Support&offset=20110121132950#MediaWiki:livetranslate-translate-to_10589
is giving more - purely informational - details.
Version: unspecified
Severity: enhancement
URL: http://translatewiki.net/wiki/Thread:Support/MediaWiki:livetranslate-translate-to