Following are a number of back-translations as well as a sample translation for translators of Isaiah 57:11:

• Kupsabiny: “Who is that one that you are afraid of and fear
  so that you did lies and did not remember/think of me?
  Do you not honor me because I have kept quiet so long
  as if I do not see anything?” (Source: Kupsabiny Back Translation)
• Newari: “Whom did you fear that you spoke lies [lit. untrue matters] to me,
  and why did you not remember me and keep me in [your] heart?
  What! [was it] because I have remained silent for so long
  that you did not fear me?” (Source: Newari Back Translation)
• Hiligaynon: “The LORD says, ‘Who are these little-gods/false-gods whom you (plur.) feared that you (plur.) lied to me? You (plur.) have-forgotten me and do- not -pay-attention to me. What is the reason why you (plur.) no-longer respect me? Is it because I seemed have-been-silent for a long period/[lit. inside] of time?” (Source: Hiligaynon Back Translation)