One language setting; localized in-memory speech per language

docs/decisions.md

@@ -92,6 +92,13 @@ tables): high risk for little gain, not done.
   file is rebuilt from its original copy + the applied edits (sound and text edits combine in one package).
 - Keys (`SUB:<LANG>:<speech>:<line>`, `MENU:<LANG>:<File>:<Section>:<Key>`) are stable and used in mod packages.
 
+## 4d. One language setting
+The editor has a single *Language* list (top bar) for voices, subtitles and menu text, starting at the language
+the game is set to on every launch (not remembered: the game's setting is what the player hears). The game
+has voices in 5 languages and texts in 11; for the other 6 it plays the INT voices, so the editor loads the INT
+voice lines with that language's texts and says so next to the list. Localized in-memory speech (one bank
+copy per voice language) is filtered the same way, so the sound list never mixes languages.
+
 ## 5. Catalog
 - Shipped CSVs per archive (names, categories, characters, original size + checksum) make loading instant and
   enable change detection; any other build is scanned at runtime (header reads only, cached).