Following are a number of back-translations as well as a sample translation for translators of Psalm 33:1:

• Chichewa Contempary Chichewa translation, 2002/2016:
  “Sing joyfully to Jehovah You righteous ones,
  it is appropriate that the straight-hearted (should be) praising Him.” (Source: Mawu a Mulungu mu Chichewa Chalero Back Translation)
• Newari:
  “All those who trust in the LORD,
  rejoice in the LORD!
  It is fitting for those with clean hearts to praise Him.” (Source: Newari Back Translation)
• Hiligaynon:
  “[You (plur.)] who (are) righteous-ones,
  [you (plur.)] be-loud/shout-cheerfully with/in joy
  because of what the LORD has-done for you (plur.).
  You (plur.) who are-living rightly,
  (it) is-fitting that you (plur.) praise him!” (Source: Hiligaynon Back Translation)
• Eastern Bru:
  “All people who are righteous should be glad in God. Praise is very correct/proper for all righteous people.” (Source: Bru Back Translation)
• Laarim:
  “You (plur.) sing to the LORD with gladness you people who do right,
  because people who obey his word should praise him.” (Source: Laarim Back Translation)
• Nyakyusa-Ngonde (back-translation into Swahili):
  “Enyi wanyofu, mwimbieni BWANA na furaha,
  kumsifu kunawafaa wanyofu.” (Source: Nyakyusa Back Translation)
• English:
  “You righteous people should sing joyfully to Yahweh
  because that is what he deserves.” (Source: Translation for Translators)