Following are a number of back-translations as well as a sample translation for translators of Jeremiah 15:8:

• Kupsabiny: “Widows will be many
  more than the sand of the ocean.
  I shall send also to the mother of a young man
  suffering while it is (mid)day.
  I shall send them anxiety and fear
  and it will hit them by surprise.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “I will-increase-the-number of your (plur.) widows, which seems as numerous than the sand in the seashore. At noon-time I will-send a destroyer against the mothers of your (plur.) male children/(sons). At-once sadness and terror will-arrive to them.” (Source: Hiligaynon Back Translation)
• English: “I will cause there to be more widows in Judah
  than there are grains of sand on the seashore.
  At noontime, when people will not be expecting it to happen, I will cause an enemy army to attack you,
  an army that will destroy your young men and cause their mothers to weep.
  I will cause you to suddenly experience great suffering/pain and become very terrified.” (Source: Translation for Translators)