Following are a number of back-translations as well as a sample translation for translators of Isaiah 42:21:

• Kupsabiny: “God loved to make his laws great
  because he is righteous.” (Source: Kupsabiny Back Translation)
• Newari: “By reason of his righteousness, it is pleasing to the LORD
  to exalt his law and fill with his glory.” (Source: Newari Back Translation)
• Hiligaynon: “The LORD would really/(intesifier) like that his law will-be-honored so-that he can show his righteousness.” (Source: Hiligaynon Back Translation)