If you are a Mastodon user that had your language set as Portuguese (Portugal) or an admin with users from Portugal, you should read this: https://github.com/tootsuite/mastodon/issues/12082
If you are an admin and have users that have set their language as 'pt' (you will see errors on your Sidekiq on some actions related to those users and the language 'pt' being invalid).
If you feel comfortable around PostgreSQL database, you can find all users that have pt as their language doing something like:
select email,locale from users where locale='pt';
Running the code mentioned in the GitHub issue should fix it. Shouldn't be a problem but run it at your own risk :) or wait for a fix
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