Following are a number of back-translations as well as a sample translation for translators of Joel 2:28:

• Kupsabiny: “God says,
  ‘Later I shall anoint
  all people with my Spirit.
  Then your daughters and your sons shall prophecy
  and your elders/old people shall get dreams.
  Your young people shall see revelations/visions.” (Source: Kupsabiny Back Translation)
• Newari: “‘At a later time,
  I will pour out my Spirit on all of people.
  Then your sons and daughters will prophesy,
  your old men will dream dreams,
  and your young men will see visions.” (Source: Newari Back Translation)
• Hiligaynon: “And some-time-later I will-give my Spirit/[Espiritu] to all kinds of people. Your (plur.) male and female children will-tell/proclaim my words/messages. Your (plur.) old males I will-cause-to-dream. Your (plur.) young males will-be-able-to-see visions.” (Source: Hiligaynon Back Translation)
• Kankanaey: “‘When that is finished, I will send my Spirit (Ispirito) so-that he will enter even any person. Your children, they will tell what I cause- them -to-tell, the young-men, there-will-be what I show them that are like dreams and the old-men, there-will- also -be what I cause- them -to-dream.” (Source: Kankanaey Back Translation)

See also complete verse (Acts 2:17).