While language packs for CourseLab are not ready, you can replace corresponding button pictures in the Module images folder (in your work copy). Please browse images/[object_code]/[corresponding color]/ folder to find pictures and replace them. [object code] is something like "q_002_select" for multiple select questions etc. Please note, that these changed pictures will be available for this particular module only, so changes should be made in every module of course.
Unfortunately, there's no simple way to change pictures in object prototypes.
While language packs for CourseLab are not ready, you can replace corresponding button pictures in the Module images folder (in your work copy). Please browse images/[object_code]/[corresponding color]/ folder to find pictures and replace them. [object code] is something like "q_002_select" for multiple select questions etc. Please note, that these changed pictures will be available for this particular module only, so changes should be made in every module of course.
Unfortunately, there's no simple way to change pictures in object prototypes.