Part of meta issue
Converting the contact form settings to the config system would help the Drupal 8 Multilingual Initiative to have a focused, simple but prominent enough example implementation to work with to add internationalization support *afterwards*. Currently there are no subsystems converted that would need internationalization support naturally and I did not find ongoing issues for any of that area either, so let's start with this one to benefit D8MI's discussion on internationalization.
The implementation can take great cues from the image effects conversion that already landed and http://groups.drupal.org/node/191283. Documentation on API for conversion:
PASSED: [[SimpleTest]]: [MySQL] 46,843 pass(es). View
PASSED: [[SimpleTest]]: [MySQL] 46,468 pass(es). View
FAILED: [[SimpleTest]]: [MySQL] Unable to apply patch drupal8.contact-config.163.patch. Unable to apply patch. See the log in the details link for more information. View