WordPress default texts

Hi there,

I am using this <?php comments_template(); // Get wp-comments.php template ?> piece of code to display comments in my own theme. However, I can’t seem to find the file that contains the default strings that it outputs. For example, above the comment form, it says something like: Tell us what you think here and now! Or something along those lines (I use a localized version). I’d like to change that, but i can’t find it.

Where are these default texts? Thank you very much in advance!