Make leave buttons more explicit

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

app/views/groups/group_members/_group_member.html.haml

@@ -40,7 +40,8 @@
            
           - if current_user == user
             = link_to leave_group_group_members_path(@group), data: { confirm: leave_group_message(@group.name)}, method: :delete, class: "btn-xs btn btn-remove", title: 'Remove user from group' do
-              %i.fa.fa-minus.fa-inverse
+              = icon("sign-out")
+              Leave
           - else
             = link_to group_group_member_path(@group, member), data: { confirm: remove_user_from_group_message(@group, member) }, method: :delete, remote: true, class: "btn-xs btn btn-remove", title: 'Remove user from group' do
               %i.fa.fa-minus.fa-inverse

app/views/projects/project_members/_project_member.html.haml

@@ -38,8 +38,9 @@
 
          
         - if current_user == user
-          = link_to leave_namespace_project_project_members_path(@project.namespace, @project), data: { confirm: "Leave project?"}, method: :delete, class: "btn-xs btn btn-remove", title: 'Leave project' do
-            %i.fa.fa-minus.fa-inverse
+          = link_to leave_namespace_project_project_members_path(@project.namespace, @project), data: { confirm: leave_project_message(@project) }, method: :delete, class: "btn-xs btn btn-remove", title: 'Leave project' do
+            = icon("sign-out")
+            Leave
         - else
           = link_to namespace_project_project_member_path(@project.namespace, @project, member), data: { confirm: remove_from_project_team_message(@project, member) }, method: :delete, remote: true, class: "btn-xs btn btn-remove", title: 'Remove user from team' do
             %i.fa.fa-minus.fa-inverse