The Grammys may have snubbed the biggest song of 2017, but “Despacito” lives on. Luis Fonsi and Daddy Yankee’s reggaeton-pop hit now has a Mandarin version for 2018. Fonsi teamed up with Singaporean pop star JJ Lin for a Spanish-Mandarin makeover titled “緩緩” (huan huan), which means “slowly.” The track was released last week: Fonsi…