Bamedize some unnecesary confirm.notify messages

app/coffee/modules/admin/memberships.coffee

@@ -284,8 +284,7 @@ MembershipsRowAdminCheckboxDirective = ($log, $repo, $confirm) ->
             $el.find(":checkbox").prop("checked", true)
 
         $el.on "click", ":checkbox", (event) =>
-            onSuccess = ->
-                $confirm.notify("success")
+            onSuccess = null
 
             onError = ->
                 $confirm.notify("error")
@@ -335,8 +334,7 @@ MembershipsRowRoleSelectorDirective = ($log, $repo, $confirm) ->
         html = render(member)
 
         $el.on "click", "select", (event) =>
-            onSuccess = ->
-                $confirm.notify("success")
+            onSuccess = null
 
             onError = ->
                 $confirm.notify("error")

app/coffee/modules/admin/roles.coffee

@@ -91,12 +91,11 @@ class RolesController extends mixOf(taiga.Controller, taiga.PageMixin, taiga.Fil
                 @confirm.notify('error')
 
     setComputable: ->
-        onSuccess = (role) =>
-            @confirm.notify('success')
+        onSuccess = null
 
         onError = =>
             @confirm.notify("error")
-            @scope.role.computable = !@scope.role.computable
+            @scope.role.revert()
 
         @repo.save(@scope.role).then onSuccess, onError
 
@@ -303,7 +302,6 @@ RolePermissionsDirective = ($repo, $confirm) ->
                 $scope.role.permissions = getActivePermissions()
 
                 onSuccess = (role) ->
-                    $confirm.notify('success')
                     categories = generateCategoriesFromRole(role)
                     categoryId = target.parents(".category-config").data("id")
                     renderResume(target.parents(".category-config"), categories[categoryId])

app/coffee/modules/common/attachments.coffee

@@ -258,7 +258,6 @@ AttachmentDirective = ($log, $repo, $confirm) ->
 
             onSuccess = ->
                 $ctrl.onDeleteAttachment(attachment)
-                $confirm.notify("success", null, "We've deleted #{subtitle}.") #TODO: i18in
 
             onError = ->
                 $confirm.notify("error", null, "We have not been able to delete #{subtitle}.") #TODO: i18in
@@ -283,7 +282,6 @@ AttachmentDirective = ($log, $repo, $confirm) ->
             onSuccess = ->
                 $ctrl.onEditAttachment(attachment)
                 render(attachment)
-                $confirm.notify("success")
 
             onError = ->
                 $confirm.notify("error")