test: Run translations tests on RHEL images
test: Run translations tests on RHEL images

Our stable branches don't run fedora-31, thus never validate translation
updates. Let's run them on rhel-* images as well to fix this.

Closes #13628

moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,cockpituous/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit,garrett/cockpit,deryni/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,martinpitt/cockpit,garrett/cockpit,cockpit-project/cockpit,martinpitt/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,garrett/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpituous/cockpit,mvollmer/cockpit,moraleslazaro/cockpit