Fix spelling, specs and codestyle in Geo flash notice.

app/controllers/admin/application_controller.rb

@@ -14,6 +14,6 @@ class Admin::ApplicationController < ApplicationController
   def display_geo_information
     return unless Gitlab::Geo.secondary?
     primary_node = link_to('primary node', Gitlab::Geo.primary_node.url)
-    flash.now[:notice] = "You are in a Geo secondary node (read-only). To make any change you must visit the #{primary_node}.".html_safe
+    flash.now[:notice] = "You are on a secondary (read-only) Geo node. If you want to make any changes, you must visit the #{primary_node}.".html_safe
   end
 end

app/controllers/oauth/geo_auth_controller.rb

@@ -46,8 +46,10 @@ class Oauth::GeoAuthController < ActionController::Base
   private
 
   def after_sign_in_with_gitlab(token, return_to)
-    primary_node = link_to('primary node', Gitlab::Geo.primary_node.url)
-    flash[:notice] = "You are in a Geo secondary node (read-only). To make any change you must visit the #{primary_node}.".html_safe
+    if Gitlab::Geo.primary_node
+      primary_node = link_to('primary node', Gitlab::Geo.primary_node.url)
+      flash.now[:notice] = "You are on a secondary (read-only) Geo node. If you want to make any changes, you must visit the #{primary_node}.".html_safe
+    end
 
     session[:access_token] = token
     redirect_to(return_to || root_path)

app/views/layouts/header/_default.html.haml

@@ -33,7 +33,7 @@
             - if Gitlab::Geo.secondary?
               %li
                 = link_to Gitlab::Geo.primary_node.url, title: 'Go to primary node', data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
-                  =icon('globe fw')
+                  = icon('globe fw')
             - if current_user.can_create_project?
               %li
                 = link_to new_project_path, title: 'New project', data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do