Following are a number of back-translations as well as a sample translation for translators of Isaiah 28:22:

• Kupsabiny: “Do not continue to despise God
  so that you are not punished very severely.
  Because I have heard that,
  the God of authority has decided
  to destroy the whole country.” (Source: Kupsabiny Back Translation)
• Newari: “Now stop the work of ridiculing, otherwise your chains will grow even heavier.
  The LORD, the LORD Almighty,
  has told me the matter that the
  whole land will be destroyed.” (Source: Newari Back Translation)
• Hiligaynon: “Therefore now you (plur.) no-longer mock, for he might add the punishment to you (plur.). For I surely heard what the Lord GOD Almighty has-commanded that he will-destroy your (plur.) entire land.” (Source: Hiligaynon Back Translation)
• English: “The Commander of the armies of angels has told me that he is going to destroy the entire land.
  So do not ridicule what I say any more,
  because if you do that
  he will punish you even more severely.” (Source: Translation for Translators)