(S)-lactate(out) + H(+)(out) => (S)-lactate(in) + H(+)(in)
(s)-lactate(out) + h(+)(out) => (s)-lactate(in) + h(+)(in)
(S)-lactate(out) + H(+)(out) => (S)-lactate(in) + H(+)(in)
(s)-lactate(out) + h(+)(out) => (s)-lactate(in) + h(+)(in)