Following are a number of back-translations as well as a sample translation for translators of Isaiah 65:8:

• Kupsabiny: “Even so, I will not destroy all the people
  because there are some who bow to me,
  like when there are good grapes
  among the bad ones.” (Source: Kupsabiny Back Translation)
• Newari: “The LORD says like this,
  "Just as there is juice in a cluster of grapes,
  [and] people will say ‘do not destroy it,’
  for there will be much more juice in it,’
  so just like that, by reason of my servants, they will not all be destroyed.” (Source: Newari Back Translation)
• Hiligaynon: “The LORD still said, ‘The cluster of grapes which have a bad fruit are not destroyed because the good fruits are still being-benefited. That is what also I will-do to my people, I will- not -destroy them all; I will-save the ones-who-serve me.” (Source: Hiligaynon Back Translation)
• English: “This is also what Yahweh said:
  ‘When there is a cluster of nice grapes on a vine,
  people do not throw them away,
  because they know that there is good juice in those grapes.
  Similarly, because there are some people in Judah who faithfully serve/worship me,
  I will not get rid of all of them.” (Source: Translation for Translators)