Following are a number of back-translations as well as a sample translation for translators of Isaiah 16:6:

• Kupsabiny: “It was heard that the people of Moab were boasting/proud.
  It is known that (they are) people who are arrogant,
  but there is nothing they can boast of.” (Source: Kupsabiny Back Translation)
• Newari: “We have heard about the arrogance of Moab.
  How proud and vain they may be
  we also know.
  But all their boasting is worthless.” (Source: Newari Back Translation)
• Hiligaynon: “We (excl.) have-heard how proud are those of/from-Moab. They are proud and arrogant/[lit. ones-who-think-highly-of-themselves], but this has no value.” (Source: Hiligaynon Back Translation)
• English: “We people of Judah have heard about the people of Moab;
  we have heard that they are very proud and conceited ;
  they are insolent,
  but what they proudly say about themselves is not true.” (Source: Translation for Translators)