give setting clearer name

app/controllers/projects_controller.rb

@@ -346,7 +346,7 @@ class ProjectsController < Projects::ApplicationController
       mirror
       mirror_trigger_builds
       mirror_user_id
-      project_wide_approvals
+      disable_overriding_approvers_per_merge_request
       repository_size_limit
       reset_approvals_on_push
       service_desk_enabled

app/views/projects/ee/_merge_request_settings.html.haml

 - form = local_assigns.fetch(:form)
 - project = local_assigns.fetch(:project)
+- can_override_approvals = !project.try(:disable_overriding_approvers_per_merge_request)
 
 .form-group
   = label_tag :merge_method_merge, class: 'label-light' do
@@ -107,8 +108,8 @@
 
   .form-group.mr-overwrite-approvals
     .checkbox
-      = form.label :project_wide_approvals do
-        = form.check_box(:project_wide_approvals, { checked: !project.project_wide_approvals }, false, true)
+      = form.label :disable_overriding_approvers_per_merge_request do
+        = form.check_box(:disable_overriding_approvers_per_merge_request, { checked: can_override_approvals }, false, true)
         %strong Can overwrite approvers and approvals required per merge request
 
   .form-group.reset-approvals-on-push

app/views/shared/issuable/_approvals.html.haml

 - issuable = local_assigns.fetch(:issuable)
-- overwritable = !issuable.target_project.project_wide_approvals
 - form = local_assigns.fetch(:form)
 
-
 - return unless issuable.is_a?(MergeRequest)
 - return unless issuable.requires_approve?
 
+- overridable = !issuable.target_project.try(:disable_overriding_approvers_per_merge_request)
+
 .form-group
   = form.label :approver_ids, class: 'control-label' do
     Approvers
   .col-sm-10
-    - if overwritable
+    - if overridable
       - author = issuable.author || current_user
       - skip_users = issuable.all_approvers_including_groups + [author]
       = users_select_tag("merge_request[approver_ids]", multiple: true, class: 'input-large', email_user: true, skip_users: skip_users)
@@ -36,7 +36,7 @@
           - issuable.overall_approvers.each do |approver|
             %li{ id: dom_id(approver.user), class: item_classes + ['approver'] }
               = link_to approver.user.name, approver.user
-              - if overwritable
+              - if overridable
                 .pull-right
                   - if unsaved_approvers
                     = link_to "#", data: { confirm: "Are you sure you want to remove approver #{approver.user.name}"}, class: "btn-xs btn btn-remove", title: 'Remove approver' do
@@ -50,7 +50,7 @@
             %li{ id: dom_id(approver_group.group), class: item_classes + ['approver-group'] }
               Group:
               = link_to approver_group.group.name, approver_group.group
-              - if issuable.target_project.approvals_overwritable_mr
+              - if overridable
                 .pull-right
                   - if unsaved_approvers
                     = link_to "#", data: { confirm: "Are you sure you want to remove group #{approver_group.group.name}"}, class: "btn-xs btn btn-remove", title: 'Remove group' do
@@ -65,9 +65,9 @@
       .form-group
         = form.label :approvals_before_merge, class: 'label-light' do
           Approvals required
-        = form.number_field :approvals_before_merge, class: 'form-control', value: issuable.approvals_required, readonly: !overwritable
+        = form.number_field :approvals_before_merge, class: 'form-control', value: issuable.approvals_required, readonly: !overridable
 
-    - if overwritable
+    - if overridable
       .help-block.suggested-approvers
         - if @suggested_approvers.any?
           Suggested approvers:

db/migrate/20170605151307_add_project_wide_approvals_to_project.rb → db/migrate/20170605151307_add_disable_overriding_approvers_per_merge_request_to_project.rb

 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
-class AddProjectWideApprovalsToProject < ActiveRecord::Migration
+class AddDisableOverridingApproversPerMergeRequestToProject < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 
   # Set this constant to true if this migration requires downtime.
@@ -26,6 +26,6 @@ class AddProjectWideApprovalsToProject < ActiveRecord::Migration
   # disable_ddl_transaction!
 
   def change
-    add_column :projects, :project_wide_approvals, :boolean
+    add_column :projects, :disable_overriding_approvers_per_merge_request, :boolean
   end
 end

db/schema.rb

@@ -1144,7 +1144,7 @@ ActiveRecord::Schema.define(version: 20170605151307) do
     t.string "import_jid"
     t.integer "cached_markdown_version"
     t.datetime "last_repository_updated_at"
-    t.boolean "project_wide_approvals"
+    t.boolean "disable_overriding_approvers_per_merge_request"
   end
 
   add_index "projects", ["ci_id"], name: "index_projects_on_ci_id", using: :btree