Following are a number of back-translations as well as a sample translation for translators of Jeremiah 30:7:

• Kupsabiny: “That day/time has become awfully bad
  with no other being like that.
  That is a day when the people of Jacob are anxious/fearful
  but (they) will be saved.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “How awful that day when it will- now -come! There is no [intensifier] (day) that can-be-like that day. That (will be a) time of difficulty to the descendants of Jacob, but in the end they will-be-saved from that situation.” (Source: Hiligaynon Back Translation)
• English: “Terrible things will soon happen;
  that will be a terrible day!
  There has never been such a time.
  It will be a time when my Israeli people will experience great trouble,
  but finally they will be saved from their sufferings.’” (Source: Translation for Translators)