Descr sounds accents.txt
descr_sounds_accents.txt is one of the sound text files used to edit the sound in M2TW.
It controls which factions use which soundset ("accent", equivalent to Voice cultures in RTW) in the game. Moving a faction's name from one accent to another will make the faction speak the latter accent in the game. If you've created a new faction in a mod, it will need to be added under one of the accents in this document, or it will be silent in the game.
You can also create new accents, following the exact same layout as in the rest of the document. As opposed to RTW, there is no hard-coded limit to the number of accents in M2TW.