Description of problem: Magahi (mag_IN) does exists in Fedora. About 13 million people speak this language in india and highly used in the local areas of india. More can be find at .. http://en.wikipedia.org/wiki/Magahi_language So creating a separate locale is nessessary.
Created attachment 576818 [details] it contains the locale for the magahi language.
This really needs to be submitted to the upstream glibc project. I've filed a bug with them. http://sourceware.org/bugzilla/show_bug.cgi?id=13968