Update proofreader.md

- I translate Discord too: https://crowdin.com/project/discord

doc/development/i18n/proofreader.md

@@ -31,6 +31,7 @@ are very appreciative of the work done by translators and proofreaders!
   - Filip Mech - [GitLab](https://gitlab.com/mehenz), [Crowdin](https://crowdin.com/profile/mehenz)
 - Portuguese, Brazilian
   - Paulo George Gomes Bezerra - [GitLab](https://gitlab.com/paulobezerra), [Crowdin](https://crowdin.com/profile/paulogomes.rep)
+  - André Gama - [GitLab](https://gitlab.com/andregamma), [Crowdin](https://crowdin.com/profile/ToeOficial)
 - Russian
   - Nikita Grylov - [GitLab](https://gitlab.com/nixel2007), [Crowdin](https://crowdin.com/profile/nixel2007)
   - Alexy Lustin - [GitLab](https://gitlab.com/allustin), [Crowdin](https://crowdin.com/profile/lustin)