Following are a number of back-translations as well as a sample translation for translators of Isaiah 31:9:

• Kupsabiny: “The ruler of soldiers shall be afraid
  and flee.
  The soldiers shall tremble
  and leave behind their flag/banner.
  The one who says these words is God
  whose fire is felt/stinking in Jerusalem.” (Source: Kupsabiny Back Translation)
• Newari: “Their fortress will tremble and collapse,
  and their commanding generals, seeing the signal flag, will become nervous and afraid,"
  LORD Almighty, whose fire is in Zion
  and [whose] kiln is in Jerusalem.
  He says.” (Source: Newari Back Translation)
• Hiligaynon: “Their soldiers will-flee for fear and their officials will-be-confused when they see the banner of their enemies. This is what the LORD has-said, whose fire is blazing in Zion, the city of Jerusalem.” (Source: Hiligaynon Back Translation)
• English: “Even their very strong soldiers will be terrified;
  they will abandon their battle flags and run away!
  Yahweh will cause his enemies who attack Jerusalem to be destroyed.
  Yahweh’s presence on Zion Hill is like a fire,
  like a furnace that blazes in Jerusalem;
  and that is what Yahweh says about what will happen to the Assyrian army!” (Source: Translation for Translators)