[docs] Remove translations section from contributing guide (#38125)

Signed-off-by: Niko Hoffrén <niko.hoffren@gmail.com>

Author: nikohoffren

CONTRIBUTING.md

@@ -16,7 +16,6 @@ If you're reading this, you're awesome! Thank you for helping us make this proje
   - [Coding style](#coding-style)
 - [How to add a new demo in the documentation](#how-to-add-a-new-demo-in-the-documentation)
 - [How can I use a change that wasn't released yet?](#how-can-i-use-a-change-that-wasnt-released-yet)
-- [Translations](#translations)
 - [Roadmap](#roadmap)
 - [License](#license)
 
@@ -345,13 +344,6 @@ $test-project> npm i ./path-to-file/mui-material-x.x.x.tar.gz
 > If you have already installed this package, your changes will not be reflected when you reinstall it.
 > As a quick fix, you can temporarily bump the version number in your `package.json` before running `yarn build`.
 
-## Translations
-
-Translations are handled via [Crowdin](https://translate.mui.com).
-You don't need to apply any changes to localized versions of our markdown files
-i.e. files having a `-locale` suffix. Crowdin automatically takes care of syncing
-these changes across the localized versions.
-
 ## Roadmap
 
 To get a sense of where MUI is heading, or for ideas on where you could contribute, take a look at the [roadmap](https://mui.com/material-ui/discover-more/roadmap/).