Following are a number of back-translations as well as a sample translation for translators of 2 Kings 23:12:

• Kupsabiny: “Then, he destroyed the things of sacrifice that his forefathers had built in the home of the king at the roof of the room of Ahaz. He also destroyed the things that Manasse had made that were in the two courtyards of the Homestead of God. He pulverized those things completely and then he went to throw the pieces in the (dry) valley of Kidron.” (Source: Kupsabiny Back Translation)
• Newari: “He tore down the altars that the kings of Judah had built on the roof terrace of the house of king Ahaz near his upper room, and the altars that Manasseh had built in the two courtyards of the LORD’s temple — reducing those altars to dust he threw them away in the Kidron valley.” (Source: Newari Back Translation)
• Hiligaynon: “He caused-to-be-destroyed the altars that were-built-up by the kings of Juda on the flat roof of the upper room of Ahaz, including the altars that Manase caused-to-be-built in the two yards/courtyards of the temple of the LORD. He smashed them into powder and spread the ashes in Kidron place-where- water -flows.” (Source: Hiligaynon Back Translation)
• English: “Josiah also commanded his servants to tear down the altars that the previous kings of Judah had built on the roof of the palace, above the room where King Ahaz had stayed. They also tore down the altars that had been built by King Manasseh in the two courtyards outside the temple. He commanded that they be smashed to pieces and thrown down into the Kidron Valley.” (Source: Translation for Translators)