The component currently doesn't use database and can't store additional information, it only reads the images from a directory. You can modify the file name on each image to get a title you want.
New features which will involve database are planned and will be implemented in future versions.
Make sure you add it both with and without "&lang=en" part. And I assume you are adding it under "Alias". Non-sef links can not be set to redirect, only to convert to SEF alias.