That's weird, this "Read more" string should be translatable:
https://github.com/jlethuau/wp-parallax-content-slider/blob/master/wp-parallax-content-slider.php#L338
The entry has also been added to the .pot file:
https://github.com/jlethuau/wp-parallax-content-slider/blob/master/locale/wp-parallax-content-slider.pot#L18
I don't know qTranslate. Maybe I forgot something but I don't know what :(