sprintf(<span style="display:block;margin:4px 0 0;line-height:1.25em;font-size:95%%"> Image credit: %$s</span>
esc_html( $credit ));

I would like to add __() function to translate Image Credit text.

sprintf(<span style="display:block;margin:4px 0 0;line-height:1.25em;font-size:95%%"> __('Image credit:','myTheme'); %$s</span>
esc_html( $credit ));