fix: Update Crowdin link (beego#841)

README.md

@@ -98,7 +98,7 @@ For casdoor, if you have any questions, you can give Issues, or you can also dir
 
 ### I18n translation
 
-If you are contributing to casdoor, please note that we use [Crowdin](https://crowdin.com/project/casdoor-web) as translating platform and i18next as translating tool. When you add some words using i18next in the ```web/``` directory, please remember to add what you have added to the ```web/src/locales/en/data.json``` file.
+If you are contributing to casdoor, please note that we use [Crowdin](https://crowdin.com/project/casdoor-site) as translating platform and i18next as translating tool. When you add some words using i18next in the ```web/``` directory, please remember to add what you have added to the ```web/src/locales/en/data.json``` file.