Updated SUSE packages for Gnome Subtitles are currently underway.
Old versions are available from the sourceforge mirrors:
Login as root and install the rpm with:
rpm -Uvh
If you prefer to use Yast, run:
yast -i
It's possible that you'll need to install any missing dependency. Do so using the graphical package installer.
Use the icon in the Gnome Menu or run it from a terminal with:
gnome-subtitles