For language I've always used the sentence in target language (the one i want to learn) in the front of the card and the translated sentence in the back of the card but I've always wondered if it should actually be the other way around.
Your suggestion with the cloze is another good approach
> I've always wondered if it should actually be the other way around
It should be both ways round. This is especially true for languages (where your brain needs e.g. French -> English for reading/listening and English -> French for writing/speaking). It's also useful even where you only need one direction because learning both directions actually strengthens the memory for the direction you need.
For language I've always used the sentence in target language (the one i want to learn) in the front of the card and the translated sentence in the back of the card but I've always wondered if it should actually be the other way around.
Your suggestion with the cloze is another good approach