The English that is translated as “says the Lord” or “says the Lord God” is translated in some influential French translations as oracle de Yahvé (La Bible de Jérusalem) oracle du Seigneur (Traduction œcuménique de la Bible), and oracle de l’Éternel (Nouvelle Version Segond Révisée 1978) or “oracle (authoritative statement) of YHWH (or: the Lord).”

Timothy Lloyd Wilt (in The Bible Translator 1999, p. 301ff. ) describes the Hebrew ne’um (adonay) YHWH (quoting S. Meier, 1992) as “a highly marked expression (…) Hebrew does not characteristically repunctuate quoted discourse with reminders of the quote’s source, making this particle’s function quite distinctive and certainly unique in its frequency and distribution.”

The French translations above are emulating this with their distinct wording containing the French oracle.

Similarly, the French translation by Chouraqui uses harangue de or “harangue (or: ‘sermon’) of YHWH” and the English translation by Fox uses Utterance of YHWH. Both of these translations are Jewish translations that attempt to emulate the Hebraic nature of the original text. (Source: Drew Maust)

The translation into Kera marks this by using the equivalent of “the words of me, YHWH” (source: Jackie Hainaut) and a language in West Africa, belonging to the Mande language family, uses a honorific form of “say,” that is only used for speech from God or his prophets. Both of these languages are spoken in francophone Africa.

See also Thus says the LORD, “By this you shall know that I am the LORD.” and tetragrammaton (YHWH).