2. Synchronize some (not all) products or product information from icecat.biz
If it doesn't synchronyze some (not all) products or product information from icecat.biz, most likely you're using Open ICEcat and it has limited database including some specific products, categories or descriptions including multiple languages.
For example, the product with model 3C13635-ME doesn't have a description in multiple languages (for example, in French) in Free Open ICEcat:
but it has in Full ICEcat: