Function
image-loader image-id &key image-translation-table => loader
An image identifier
An image translation table
An image load function
image-loader function returns the image load function that would be called to load the image associated with image-id in image-translation-table. If the image-id is not registered with a load function, the default image load function is returned. The default value of image-translation-table is*default-image-translation-table*.