Following are a number of back-translations as well as a sample translation for translators of Isaiah 23:4:

• Kupsabiny: “Hold your mouth, oh, Sidon,
  the city of the ocean!
  The ocean said,
  ‘Oh, you city of the ocean,
  I am like one who has never born a child.’” (Source: Kupsabiny Back Translation)
• Newari: “Be ashamed, O Sidon, you [lit.: that] fortress located near the sea.
  for the sea has spoken like this,
  "I have neither had the pain of childbirth, nor have I given birth to a child.
  I have neither brought up a son, [lit.: caused a son to grow up] nor have I brought up daughters." [lit.: made daughters big]” (Source: Newari Back Translation)
• Hiligaynon: “You (plur.) be-ashamed, city of Sidon, the place-of-refuge of the people who dwell near the sea. The seas are-rejecting you (sing.) now saying, ‘I do not have a child anymore; I do not have a male or female child to take-care-of.’” (Source: Hiligaynon Back Translation)
• English: “But now you people in Sidon should be ashamed,
  because you trusted in Tyre, which has been a strong fortress on an island in the sea.
  Tyre is like a woman who is saying,
  ‘Now it is as though I have not given birth to any children,
  or raised any sons or daughters.’” (Source: Translation for Translators)