Following are a number of back-translations as well as a sample translation for translators of Joel 2:29:

• Kupsabiny: “I will also anoint with my Spirit in those days
  servants/slaves whether men or women.” (Source: Kupsabiny Back Translation)
• Newari: “And on that day, I will also pour out my spirit
  on my men servants and women servants.” (Source: Newari Back Translation)
• Hiligaynon: “In that time I will- also -give my Spirit to male and female servants.” (Source: Hiligaynon Back Translation)
• Kankanaey: “Even the males and females who are slaves, I will send my Spirit to enter them.” (Source: Kankanaey Back Translation)

See also complete verse (Acts 2:18),