Following are a number of back-translations as well as a sample translation for translators of Psalm 135:9:

• Chichewa Contempary Chichewa translation, 2002/2016:
  “He sent miraculous signs and wonders amidst you, you Egypt,
  in opposition with Pharaoh together with all his servants.” (Source: Mawu a Mulungu mu Chichewa Chalero Back Translation)
• Newari:
  “O Egypt, in your place He showed signs
  and amazing works among Pharaoh
  and all his courtiers.” (Source: Newari Back Translation)
• Hiligaynon:
  “There in Egipto, he performed/[lit. did] miracles and shocking/amazing things to punish the king of Egipto and all his officials.” (Source: Hiligaynon Back Translation)
• Laarim:
  “God performed miracles and wonders in your midst of people of Egypt,
  these fought against the king of Egypt and all of his officials.” (Source: Laarim Back Translation)
• Nyakyusa-Ngonde (back-translation into Swahili):
  “Alituma ishara na miujiza,
  kule katika nchi ya Misri,
  kwa Farao na wafanyakazi wake wote.” (Source: Nyakyusa Back Translation)
• English:
  “There he performed many kinds of miracles
  to punish the king and all his officials.” (Source: Translation for Translators)