Following are a number of back-translations as well as a sample translation for translators of Isaiah 8:12:

• Kupsabiny: “‘Do not think that everything is a conspiracy,
  like some people are saying/claiming.
  Do not fear the words/things that those people fear,
  or be afraid like them.” (Source: Kupsabiny Back Translation)
• Newari: “You must not trust any of the plots
  these people are thinking up.
  Do not fear what they fear
  and do not let your heart panic [lit.: beat with a flapping sound]. ” (Source: Newari Back Translation)
• Hiligaynon: “Do- not -believe to what they are-saying that you (plur.) are traitors. You (plur.) do- not -be-afraid of what- they -fear-for, and you (plur.) do- not -be-nervous.” (Source: Hiligaynon Back Translation)
• English: “‘Do not say that everything that people do is conspiring/rebelling against the government,
  like other people say,
  and do not be afraid of/worry about the things that other people are afraid of.” (Source: Translation for Translators)