Language block Images doesn't show up!

Hi everyone,
I have this Problem;
Because custom modules folder has been moved from /modules folder to /sites/mydomain/modules, there is problem of displaying language flag on language switch block & translation block, they still reference the old place that is /modules/i18n/flags/en.png

currently I have created folder /modules/i18n/flags/ and copied the images there. How can I fix it permanently so that I don't need to copy the files to this folder?

thanks

Emmanuel