<p></p>
<p><b>@tomhughes</b> commented on this pull request.</p>

<p dir="auto">Looks great to me!</p><hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/6449#discussion_r2433699258">test/mailers/previews/user_mailer_preview.rb</a>:</p>
<pre style='color:#555'>> +class UserMailerPreview < ActionMailer::Preview
+  include FactoryBot::Syntax::Methods
+
+  # Wraps the preview in a transaction, so that no changes
+  # are persisted to the development db
+  def self.call(...)
+    preview = nil
+    ActiveRecord::Base.transaction do
+      preview = super(...)
+      raise ActiveRecord::Rollback
+    end
+    preview
+  end
+
+  def diary_comment_notification
+    recipient = create(:user)
</pre>
<p dir="auto">This should probably set the user language so that the local selector in the preview works - something like:</p>
⬇️ Suggested change
<pre style="color: #555">-    recipient = create(:user)
+    recipient = create(:user, :languages => [I18n.locale])
</pre>


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