refactor: adress review comments

docs/development-progress-log.md

@@ -805,7 +805,8 @@ end
 - **Join confirmation:** Domain wrapper `submit_join_request/2` generates token (or uses optional `:confirmation_token` in attrs for tests), creates JoinRequest via action `:submit`, then sends one email via `MvWeb.Emails.JoinConfirmationEmail`. Route `GET /confirm_join/:token` (JoinConfirmController) updates to `submitted`; idempotent; expired/invalid handled.
 - **Senders migrated:** `SendNewUserConfirmationEmail`, `SendPasswordResetEmail` use layout + `Mv.Mailer.mail_from/0`.
 - **Cleanup:** Mix task `mix join_requests.cleanup_expired` hard-deletes JoinRequests in `pending_confirmation` with expired `confirmation_token_expires_at` (authorize?: false). For cron/Oban.
-- **Gettext:** New email strings in default domain; German translations in de/LC_MESSAGES/default.po.
+- **Gettext:** New email strings in default domain; German translations in de/LC_MESSAGES/default.po; English msgstr filled for email-related strings.
+- **PR review follow-ups (Join confirmation):** Join confirmation email uses `Mailer.deliver/1` and returns `{:ok, email}` \| `{:error, reason}`; domain logs delivery errors but still returns `{:ok, request}` so the user sees success. Comment in `submit_join_request/2` clarifies that the raw token is hashed by `JoinRequest.Changes.SetConfirmationToken`. Cleanup task uses `Ash.bulk_destroy` and logs partial errors without halting. Layout uses assigns `app_name` and `locale` (from config/Gettext) instead of hardcoded "Mila" and `lang="de"`. Production `runtime.exs` sets `:mail_from` from ENV (`MAIL_FROM_NAME`, `MAIL_FROM_EMAIL`). Layout reference unified to `"layout.html"`; redundant `put_layout` removed from senders.
 - Tests: `join_request_test.exs`, `join_request_submit_email_test.exs`, `join_confirm_controller_test.exs` – all pass.
 
 ### Test Data Management