The language in which one or more of your products have been submitted in Merchant Center differs from the language on your landing pages and throughout the checkout process.
In order to show your products on Google, you must submit your product data in a supported language and ensure that the language is the same for both the feed and the checkout process. This includes the majority of the product data and all website pages needed for a user to navigate and make an informed purchase all the way through the checkout process.
You should have received an email asking that you update the language of your product data and/or website by a certain date.
Make sure that you use one of the supported languages for Merchant Center and that you consistently use the same language across your Merchant Center product data and website. Learn more about supported languages