# Chaves de interpolação inválidas / Quebrado pela atualização

**URL:** <https://meta.discourse.org/t/invalid-interpolation-keys-broken-by-update/82117>\
**Category:** Product Support\
**Created:** [3 Março , 2018 10:11 UTC](https://meta.discourse.org/t/invalid-interpolation-keys-broken-by-update/82117 "2018-03-03T10:11:35Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![\_fuchs](https://avatars.discourse-cdn.com/v4/letter/_/5f9b8f/32.png) [@\_fuchs](https://meta.discourse.org/u/_fuchs)\
**Post date:** [3 Março , 2018 10:11 UTC](https://meta.discourse.org/t/invalid-interpolation-keys-broken-by-update/82117/1 "2018-03-03T10:11:35Z")

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We want to modify `user_notifications.reply_by_email` to achieve something similar to this:

> [@Customize email notification footer with links to reply privately and see user profiles](https://meta.discourse.org/t/email-notification-footer-with-links-for-reply-privately-sender-profile-and-user-profile/50305):
>
> To help transition listserv and email users to the online forum, I added the following footer to the reply-by-email notification. I thought I would share. The email footer View Thread or reply to this email. Your response will be posted to the site and emailed to the group. Reply to sender privately about this topic. Visit sender’s profile for more info. Update your profile and set your email preferences. View Email Tips for help on posting by email. How to implement Admin → Customize →…

While this worked fine editing the text is now impossible because `topic_title_url_encoded` and `username` are invalid now:

> The following interpolation key(s) are invalid: “username, topic\_title\_url\_encoded”

I suppose that this has to do with the validation (see [Bulk Invite from File resets the Invite Forum Mailer customized text - #16 by tgxworld](https://meta.discourse.org/t/bulk-invite-from-file-resets-the-invite-forum-mailer-customized-text/67606/16)). However i am not sure why username and the title url should not be in the e-mail response.

Additionally, `topic_title_url_encoded` should be [whitelisted](https://github.com/discourse/discourse/blob/1c2d1682ae29c36190c959b827d07e162acccffe/app/models/translation_override.rb#L5-L12) but is still “invalid”.

By the way: Is there a list of (valid?) Interpolation keys?

Thank you very much

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_[View the full topic](https://meta.discourse.org/t/invalid-interpolation-keys-broken-by-update/82117)._