Fix translation platform to Crowdin (#13443)

README.md

@@ -80,7 +80,7 @@ A **Vagrant** configuration is included for development purposes.
 
 Mastodon is **free, open-source software** licensed under **AGPLv3**.
 
-You can open issues for bugs you've found or features you think are missing. You can also submit pull requests to this repository, or submit translations using Weblate. To get started, take a look at [CONTRIBUTING.md](CONTRIBUTING.md). If your contributions are accepted into Mastodon, you can request to be paid through [our OpenCollective](https://opencollective.com/mastodon).
+You can open issues for bugs you've found or features you think are missing. You can also submit pull requests to this repository, or submit translations using Crowdin. To get started, take a look at [CONTRIBUTING.md](CONTRIBUTING.md). If your contributions are accepted into Mastodon, you can request to be paid through [our OpenCollective](https://opencollective.com/mastodon).
 
 **IRC channel**: #mastodon on irc.freenode.net