Replace `can be merged` with `can be accepted`

app/views/projects/merge_requests/widget/open/_approve.html.haml

 %div
   %h4
     Requires #{pluralize(@merge_request.approvals_left, 'approval')}
-  %p Each merge request in this project must be approved by #{pluralize(@merge_request.approvals_required, 'user')} before it can be merged
+  %p Each merge request in this project must be approved by #{pluralize(@merge_request.approvals_required, 'user')} before it can be accepted
   - unless @merge_request.approved_by?(current_user)
     .append-bottom-10
       = form_for [:approve, @project.namespace.becomes(Namespace), @project, @merge_request], method: :post do |f|
         = f.submit "Approve Merge Request", class: "btn btn-primary approve-btn"
\ No newline at end of file
-