Comment 3 for bug 1850035

Looks like en_US.UTF-8 is a way to go. RHEL 7 will not get C.UTF-8 support.

From bugzilla:

"Given that RHEL 7 is entering maintenance phase 1 at the end of 2019, and this issue doesn't have upstream resolution yet, I'm moving to RHEL 8.0. In RHEL 8.0 we inherited the C.UTF-8 locale from Fedora and this needs fixing. We should fix the code-point issue at a minimum."