Do not use two %s in translation string

Introduced in commit b435a7a2.
Two %s are hard to translate.
Addressing:
Found 1 malformed strings
app/models/glue/provider.rb: _("Subscription manifest %s for provider '%s' failed") %
RPM build errors:
error: Bad exit status from /var/tmp/rpm-tmp.E0AL96 (%build)
    Bad exit status from /var/tmp/rpm-tmp.E0AL96 (%build)

Additionally building string from two translated strings are very often hard for translators
to manage.
See BZ 886718 for example of such case.
Merge pull request #1757 from xsuchy/pull-req-b435a7a2-fix3

Do not use two %s in translation string
spec - sorting, cleaning and indenting
spec - enabling scl for rhel6
Merge pull request #1758 from lzap/scl-katello

Katello SCL for RHEL6
915289 - Fixing missing fonts
spec - enabling scl for rhel6 - fixing F18
Merge pull request #1759 from daviddavis/font404

915289 - Fixing missing fonts
Merge pull request #1760 from lzap/scl-katello

spec - enabling scl for rhel6 - fixing F18
relax-org-name - only block <, >, and / in org names
Merge pull request #1755 from thomasmckay/relax-org-name

relax-org-name - allow more flexible org naming now that there are labels