Fix 404 error when visit group label edit page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

config/routes/group.rb

 resources :groups, only: [:index, :new, :create]
 
-scope(path: 'groups/*id',
-      controller: :groups,
-      constraints: { id: Gitlab::Regex.namespace_route_regex }) do
-  get :edit, as: :edit_group
-  get :issues, as: :issues_group
-  get :merge_requests, as: :merge_requests_group
-  get :projects, as: :projects_group
-  get :activity, as: :activity_group
-end
-
 scope(path: 'groups/*group_id',
       module: :groups,
       as: :group,
@@ -22,10 +12,20 @@ scope(path: 'groups/*group_id',
   resource :avatar, only: [:destroy]
   resources :milestones, constraints: { id: /[^\/]+/ }, only: [:index, :show, :update, :new, :create]
 
-  resources :labels, except: [:show], constraints: { id: /\d+/ } do
+  resources :labels, except: [:show] do
     post :toggle_subscription, on: :member
   end
 end
 
+scope(path: 'groups/*id',
+      controller: :groups,
+      constraints: { id: Gitlab::Regex.namespace_route_regex }) do
+  get :edit, as: :edit_group
+  get :issues, as: :issues_group
+  get :merge_requests, as: :merge_requests_group
+  get :projects, as: :projects_group
+  get :activity, as: :activity_group
+end
+
 # Must be last route in this file
 get 'groups/*id' => 'groups#show', as: :group_canonical, constraints: { id: Gitlab::Regex.namespace_route_regex }

spec/features/groups/labels/edit_spec.rb

+require 'spec_helper'
+
+feature 'Edit group label', feature: true do
+  given(:user)  { create(:user) }
+  given(:group) { create(:group) }
+  given(:label) { create(:group_label, group: group) }
+
+  background do
+    group.add_owner(user)
+    login_as(user)
+    visit edit_group_label_path(group, label)
+  end
+
+  scenario 'update label with new title' do
+    fill_in 'label_title', with: 'new label name'
+    click_button 'Save changes'
+
+    expect(current_path).to eq(root_path)
+    expect(label.reload.title).to eq('new label name')
+  end
+end