Consistently case `Back to X` links.

app/views/layouts/nav/_group.html.haml

@@ -3,7 +3,7 @@
     = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'}, class: 'back-link' do
       = icon('caret-square-o-left fw')
       %span
-        Back to Dashboard
+        Back to dashboard
   %li.separate-item

app/views/layouts/nav/_profile.html.haml

@@ -3,7 +3,7 @@
     = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'}, class: 'back-link' do
       = icon('caret-square-o-left fw')
       %span
-        Back to Dashboard
+        Back to dashboard
   %li.separate-item

app/views/layouts/nav/_project.html.haml

@@ -4,13 +4,13 @@
       = link_to group_path(@project.group), title: 'Back to group', data: {placement: 'right'}, class: 'back-link' do
         = icon('caret-square-o-left fw')
         %span
-          Back to Group
+          Back to group
   - else
     = nav_link do
       = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'}, class: 'back-link' do
         = icon('caret-square-o-left fw')
         %span
-          Back to Dashboard
+          Back to dashboard
   %li.separate-item

features/steps/groups.rb

@@ -6,7 +6,7 @@ class Spinach::Features::Groups < Spinach::FeatureSteps
   include Select2Helper
   step 'I should see back to dashboard button' do
-    expect(page).to have_content 'Back to Dashboard'
+    expect(page).to have_content 'Back to dashboard'
   end
   step 'gitlab user "Mike"' do

features/steps/project/project.rb

@@ -124,10 +124,10 @@ class Spinach::Features::Project < Spinach::FeatureSteps
   end
   step 'I should see back to dashboard button' do
-    expect(page).to have_content 'Back to Dashboard'
+    expect(page).to have_content 'Back to dashboard'
   end
   step 'I should see back to group button' do
-    expect(page).to have_content 'Back to Group'
+    expect(page).to have_content 'Back to group'
   end
 end