I am somewhat familiar with making themes and adding custom menu entries to grub 2. However, I installed 13.1 (zypper dup) and everything is working fine, but my grub2 menu(the text portion) still says 12.3.
I know I could edit my grub.cfg, but that’s a little taboo. I’m not sure if the problem is /etc/grub.d/30-os-prober, or what. I’ve run grub2-mkconfig since installing so that’s not the problem. This is on my desktop. Just don’t know how to edit the non-custom menu entries.
after some searching, I realized I overlooked the /etc/default/grub file. I changed the Distributor to openSUSE 13.1 . I’m expecting that to work after a
grub2-mkconfig -o /boot/grub2/grub.cfg
and a reboot
This site is worth a read for changing titles
Grub 2 Title Tweaks Thread
also, if you’re having trouble reading through the grub.d scripts because of undefined functions
you might want to look at /usr/share/grub2/grub-mkconfig-lib
You can also use YaST->System->Boot Loader->Boot Loader Options to change this and other grub2 configuration items.