[3946] Add default values for settings example. Update local config

Hi,

I submitted a Pull Request. Details:

PR: https://github.com/theforeman/foreman/pull/1316
Bug: Bug #3946: Non explicit error of Foreman crashes when no domain is setup on the host - Foreman

Diff:

config/application.rb
89 89 # config.i18n.default_locale = :de

90 + config.i18n.enforce_available_locales = false

91 + I18n.config.enforce_available_locales = false

config/settings.yaml.example
16 16 # Mark translated strings with X characters (for developers)

17 17 :mark_translated: false

18 +

19 +# Valid email address of the app admin

20 +:administrator: user@domain.com

21 +

22 +# URL where your Foreman instance is reachable

23 +:foreman_url: 'http://0.0.0.0'

24 +:unattended_url: 'http://0.0.0.0'

Notes: The test job didn't start because I'm not whitelisted,
if someone can start one I would appreciate it.

Thanks,
Maria