Unfortunately, they don't accept non-English books... but they do provide all the tools and guidelines they use for their books, so if someone wanted to make & release non-English books elsewhere I don't imagine there'd be problems.
garden
Not a book suggestion, but I cannot recommend Standard Ebooks highly enough as a source of public domain ebooks. Professionally typeset, with consistent standards, all while being free and volunteer-driven!
Just wait until you hear about toonies
I'll second Small, Angry Planet. It's not always a happy series (one of the books takes place in the aftermath of a catastrophic disaster) but it is always a hopeful series, utterly unlike the sci-fi I usually go for. It's an indifferent universe full of very different people who will ultimately pull together and support each other, and that kindness prevails.
Howl's Moving Castle trilogy was very gentle and got me through one of my darkest times, so I'll always recommend it to people seeking a chill, comforting series.
For something a bit more modern the Legends & Lattes series has proven to be quite cozy, with a healthy dose of adventure mixed in. (It's mostly coffee & pastry porn).
Would you say the first Stormlight arc ended at a good spot? I'm eager to start the series but have been staying away because it's unfinished...
Don't miss out on the other loosely-related books in the trilogy, they're just as cozy.
Finally—my transformation beyond the bounds of flesh is complete!