Merge pull request #234 from vuejs-translations/b6b270fd

Add polish language to work in progress section (#233)

Author: Abdelaziz18003

src/translations/index.md

@@ -25,6 +25,7 @@ aside: false
 - [العربية / Arabic](https://ar.vuejs.org/) [[source](https://github.com/vuejs-translations/docs-ar)]
 - [Español / Spanish](https://vue3-spanish-docs.netlify.app/) [[source](https://github.com/icarusgk/vuejs-spanish-docs)]
 - [Deutsch / German](https://de.vuejs.org/) [[source](https://github.com/vuejs-translations/docs-de)]
+- [Polski / Polish](https://pl.vuejs.org/) [[source](https://github.com/vuejs-translations/docs-pl)]
 
 ## Starting a new Translation {#starting-a-new-translation}