http://www.blackwyrmlair.net/Tools/tlkeditor.php

IE Talk Table Editor has been updated! V1.02 includes the fix of an important, newly discovered bug. The problem appeared when you have made a new entry or have edited an existing one in BG2's dialog.tlk, and it contained empty lines. Due to the way BG2 interprets CR/LF characters, the lines appeared duplicated in your game. This has been successfully fixed. Many thanks to Vlad for his bug report and for trying out the new version before its release!