Following are a number of back-translations as well as a sample translation for translators of Isaiah 54:10:

• Kupsabiny: “Mountains may rise/get up
  and hills be removed
  but never shall the love be extinguished
  that I have for you.
  I shall not break the covenant of peace
  that I said that I will never abandon you.
  I am the God who has compassion on you.” (Source: Kupsabiny Back Translation)
• Newari: “Even though the mountains are shaken and the hills are moved away,
  still my forever existing faithful love for you will never end.
  And I will never break the covenant of peace what I sealed,"
  says the LORD who has compassion on you.” (Source: Newari Back Translation)
• Hiligaynon: “Even if the mountains will-landslide/breaks-up, my love will- never [intensifier] -vanish/[lit. will-be-lost], as-well as my covenant with you (sing.) that I will-give you (sing.) a good situation. I, the LORD who has mercy on you (sing.), (am) the-(one) saying this.” (Source: Hiligaynon Back Translation)