While this particular article was about SRS for learning programming (note: very interesting - may experiment applying this to teaching kids/young adults coding - possibly with a "limited, variable sugar reward system"), SRS can be applied to language learning, In fact, in language learning, it can be a fancy way of avoiding saying 'rote memorization'. The hard part for most people of language learning is 'rote memorization' (e.g. knowing conjugations cold, without thinking).

For those of you who are interested in language learning, I'd like to redirect you to tokenadult's very long and comprehensive post from 2.6 years ago.

"Learning foreign languages to high levels of communication proficiency was the first adult learning challenge I took on. I majored in Chinese at university and worked for quite a few years as a Chinese-English interpreter and translator..."

https://news.ycombinator.com/item?id=6302816

Brief aside on non-Anki SRS. Memrise is a SRS for language learning that I gave up on because it took 3-4x longer to demonstrate that I 'knew' a word because of the variations on testing (cloze, completion, multiple choice (guess). Also, no fault of Memrise - but the problem of SRS is that a) the decks cannot be reversed - e.g. French to English cannot easily be made English to French and b) eventually you just start spitting out entire phrases rather than individual words. Context is everything. Language can be subtle. We may forget the subtleties in our native language(s).