rubygem-locale from home:smarty12:rubygem project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:smarty12:rubygem/openSUSE_Leap_15.6/home:smarty12:rubygem.repo zypper refresh zypper install rubygem-locale