en_tn/psa/097/001.md

let the earth rejoice; let the many coastlands be glad

The earth and the coastlands are said to have emotions like people. AT: "Rejoice and be glad every person on the earth and near the seas" (See: rc://en/ta/man/translate/figs-personification)

Righteousness and justice are the foundation of his throne.

Here "the foundation of his throne" refers to how Yahweh rules his kingdom. AT: "Yahweh always rules with righteousness and justice." (See: rc://en/ta/man/translate/figs-metonymy)