Incorrect locale settings cause installation failure

Issue

• The satellite-installer command correctly refuses to run when UTF-8 is not set.
• Overriding LANG is not the appropriate course of action for Satellite. The system needs to be configured for UTF-8.
• This error may be seen:

Error : [ERROR 2018-12-11 21:18:55 main]  Could not send report: invalid byte sequence in US-ASCII
Proxy satellite.example.com cannot be registered: Unable to communicate with the Capsule: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([RestClient::SSLCertificateNotVerified]: SSL_connect returned=1 errno=0 state=error: certificate verify failed) for Capsule https://satellite.example.com:9090/features Please check the Capsule is configured and running on the host.
/usr/share/foreman-installer/modules/foreman/lib/puppet/provider/foreman_smartproxy/rest_v3.rb:23:in `create'