Looks good now! I've approved it.

BTW, what do I need to do now to get my translation approved?

Nothing. You just wait -- or in this case I just approved it.

Thanks Steffan!

I added the last failure message.

The assert in the first place you pointed out is to give the user an intelligible error if they return the result in an incorrect format.

BTW, what do I need to do now to get my translation approved?

Nice job on your first translation :D

assert {idx_1, idx_2}

Did you mean to put assert there?

assert n_1 + n_2 == target

Please also add a failure message.

Added an Elixir translation