Fix existing user records with now-renamed pt locale (#12092)

Fix #12082

db/migrate/20191007013357_update_pt_locales.rb

@@ -0,0 +1,11 @@
+class UpdatePtLocales < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    User.where(locale: 'pt').in_batches.update_all(locale: 'pt-PT')
+  end
+
+  def down
+    User.where(locale: 'pt-PT').in_batches.update_all(locale: 'pt')
+  end
+end