Use "Sign out" instead of "Logout" for consistency.

app/views/layouts/_head_panel.html.haml

@@ -39,7 +39,7 @@
             = link_to profile_path, title: "Profile settings", class: 'has_bottom_tooltip', 'data-original-title' => 'Profile settings"'  do
               %i.fa.fa-user
           %li
-            = link_to destroy_user_session_path, class: "logout", method: :delete, title: "Logout", class: 'has_bottom_tooltip', 'data-original-title' => 'Logout'  do
+            = link_to destroy_user_session_path, class: "logout", method: :delete, title: "Sign out", class: 'has_bottom_tooltip', 'data-original-title' => 'Sign out'  do
               %i.fa.fa-sign-out
           %li.hidden-xs
             = link_to current_user, class: "profile-pic has_bottom_tooltip", id: 'profile-pic', 'data-original-title' => 'Your profile' do