I see the following message while activating Parallels Desktop for Mac:
This product key is for the Simplified Chinese version of Parallels Desktop only.
You use a key for Simplified Chinese localization, but Parallels Desktop interface is displayed in another language, configured for your Mac OS.
If you would like to have Parallels Desktop interface in Simplified Chinese, restart Parallels Desktop to ensure the whole interface is switched to Simplified Chinese.
If you would like to use Parallels Desktop in another language, you should buy a license for another localization.
You can place an order at Parallels Online Store. Make sure you select localization of the Online Store page other than Chinese. Select your language from the drop-down menu in the top right corner of the screen to change the localization of the Parallels Online Store page: