Add basic self hosted onboarding (#1177)

* Add basic self hosted onboarding

* Lint fix

* Normalize translations

app/controllers/concerns/authentication.rb

@@ -17,7 +17,11 @@ module Authentication
       if user = User.find_by(id: session[:user_id])
         Current.user = user
       else
-        redirect_to new_session_url
+        if self_hosted_first_login?
+          redirect_to new_registration_url
+        else
+          redirect_to new_session_url
+        end
       end
     end
 
@@ -36,4 +40,8 @@ module Authentication
     def set_last_login_at
       Current.user.update(last_login_at: DateTime.now)
     end
+
+    def self_hosted_first_login?
+      Rails.application.config.app_mode.self_hosted? && User.count.zero?
+    end
 end

app/controllers/concerns/invitable.rb

@@ -7,6 +7,10 @@ module Invitable
 
   private
     def invite_code_required?
-      ENV["REQUIRE_INVITE_CODE"] == "true"
+      self_hosted? ? Setting.require_invite_for_signup : ENV["REQUIRE_INVITE_CODE"] == "true"
+    end
+
+    def self_hosted?
+      Rails.application.config.app_mode.self_hosted?
     end
 end

app/controllers/concerns/self_hostable.rb

@@ -2,11 +2,15 @@ module SelfHostable
   extend ActiveSupport::Concern
 
   included do
-    helper_method :self_hosted?
+    helper_method :self_hosted?, :self_hosted_first_login?
   end
 
   private
     def self_hosted?
       Rails.configuration.app_mode.self_hosted?
     end
+
+    def self_hosted_first_login?
+      self_hosted? && User.count.zero?
+    end
 end