Like many languages (but unlike Greek or Hebrew or English), Spanish uses a formal vs. informal second-person pronoun (a familiar vs. a respectful “you”). Spanish Bibles all use only the informal second-person pronoun (tú), with the exception of Dios Habla Hoy (third edition: 1996) which also uses the formal pronoun (usted). In the referenced verses, the formal form is used.
Sources and for more information: P. Ellingworth in The Bible Translator 2002, p. 143ff. and R. Ross in The Bible Translator 1993, p. 217ff. .
See also the use of the formal vs. the informal pronoun in the Gospels in Tuvan.