Some translations set poetry farther to the right than the rest of the text to show that it is poetry. The ULB does this with the poetry in this chapter.
While it appears that this chapter is a continuation of the prophecy from the previous chapter, it actually looks at the whole of the Assyrian conquest as Yahweh's punishment on the world. (See: [[rc://en/tw/dict/bible/kt/prophet]])
The mention of an "everlasting covenant" in this chapter is probably not to a specific covenant with Abraham or Moses. Instead, it is an expectation that mankind would obey Yahweh. Some consider this to be a covenant Yahweh made with Adam. (See: [[rc://en/tw/dict/bible/kt/eternity]] and [[rc://en/tw/dict/bible/kt/covenant]])
This chapter appears to prophesy about a time of restoration when the Messiah will reign. This chapter pictures a time of great peace and harmony in the world. The translator should not add explanation, but should try to maintain the tense of the original text, as a future or uncompleted action. (See: [[rc://en/tw/dict/bible/kt/restore]] and [[rc://en/tw/dict/bible/kt/prophet]] and [[rc://en/tw/dict/bible/kt/christ]])