Following are a number of back-translations as well as a sample translation for translators of Isaiah 57:15:

• Kupsabiny: “This is what the God who is in heaven/up says,
  he whose name is righteous and who lives forever.
  ‘I live up where it is holy.
  I live with people who repent
  and humble themselves.
  I strengthen those people who humble themselves
  and I give power to those people who repent.” (Source: Kupsabiny Back Translation)
• Newari: “For the one who lives forever,
  who is worthy to be greatly honored, whose name is holy,
  he says, "I, the most high, I live in a high and holy place,
  but I also live with those who are penitent and humble,
  and I will strengthen you with a humble spirit,
  and [I] will also strengthen your repentant heart.” (Source: Newari Back Translation)
• Hiligaynon: “This is still what the Most High God, the Holy God who lives without end says: ‘I live/dwell in the high and holy place, but I also live/dwell with the people who are humble and repentant, so-that I could strengthen them.” (Source: Hiligaynon Back Translation)