As you may recall from 2020 setup experience, for BizTalk Developer Tools, in addition to installing CU package, also update/install new version of BizTalk Server Visual Studio extension (220.127.116.11). The extension can be installed from https://marketplace.visualstudio.com/items?itemName=ms-biztalk.BizTalk or within Visual Studio - Manage Extensions.
As a standard practice, EN download is made available by default. All other language packages will be made available on need basis. If a download is not available for the supported BizTalk language that you need, please contact me for the same.