Conditionally show authentic OAuth application message for internal GitLab apps
As pointed out by @winh, https://gitlab.slack.com/archives/C3W3PSR88/p1537774038000100
When going through the OAuth sign-in process for Gitter there is a message which isn't accurate. Gitter is provided GitLab and we should conditionally show/hide that part for internal GitLab OAuth apps.
Please note that this application is not provided by GitLab and you should verify its authenticity before allowing access.
Add a way to mark an OAuth application as internal to GitLab to conditionally show the
not provided by GitLab message.
Perhaps make a fancy OAuth page just for Gitter