I'm using the lightbox single image shortcode to insert several images into a single page (inside tabbed navigation). This has the effect of creating a "gallery", so I get navigation arrows and the text "Image X of X". However, that's not what I intend. I want to open the lightbox just for a single image. Is there a way to disable this?

Failing this, how can I localize the text "image x of x" since it's not found on the translation options? In which file can I find those strings?