FIX: Ensure that post action moderation post uses the site's default locale.

https://meta.discourse.org/t/a-post-in-looking-for-someone-to-customize-discourse-to-create-a-forum-site-requires-staff-attention/67468/5?u=tgxworld

spec/support/integration_helpers.rb

@@ -3,7 +3,7 @@ module IntegrationHelpers
     password = 'somecomplicatedpassword'
     user.update!(password: password)
     Fabricate(:email_token, confirmed: true, user: user)
-    post "/session.json", login: user.username, password: password
+    xhr :post, "/session.json", login: user.username, password: password
     expect(response).to be_success
   end
 end