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
-  - 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"
-
+%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 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