Following are a number of back-translations as well as a sample translation for translators of Isaiah 18:7:

• Kupsabiny: “Those people who are tall
  and each one has a smooth appearance shall bring gifts to God.
  That community is fierce and feared all over the world
  and rivers crisscross their land.
  Those people shall bring their things to the mountain of Zion,
  where the God of authority is being prayed to.” (Source: Kupsabiny Back Translation)
• Newari: “At that time gifts will be brought before Almighty
  from a Nation which people tall and smooth skin,
  The people feared near and far from them,
  They were very strong and victorious
  Their language is strange, their country is divided by river
  The people of this nation will bring gifts to the place of the name of the LORD Almighty, on Mount Zion, the peoples of these nations will bring a gift.” (Source: Newari Back Translation)
• Hiligaynon: “But a time will-arrive that the LORD Almighty will-receive a gift from these land which are-divided by the rivers. Its people are tall, fine skin, powerful and being-feared everywhere. They will-bring their gifts to Mount Zion, where the LORD Almighty is-honored.” (Source: Hiligaynon Back Translation)
• English: “At that time, the people of that land that is divided by the branches of that one big river will take gifts to Yahweh in Jerusalem.
  Those tall people who have smooth/dark skin, whom people everywhere are afraid of,
  because they conquer and destroy many countries,
  will take gifts to Jerusalem, the city where the Commander of the armies of angels lives.” (Source: Translation for Translators)