Just a small typo at the bottom of the
comment-template.php file, which makes the word previous to "BackType" run into it (e.g. "Additional comments powered byBackType").
I suggest this line is changed to:
echo '<p class="btc-powered">'. sprintf(__('Additional comments powered by %s', 'btcnew'), '<a href="http://www.backtype.com/search?q=' . get_permalink($post->ID) . '">BackType</a>' ). '</p>';
This is a more translation friendly way of doing it, and adds the space in English.
Hope this helps.