Introduce initial language code setting

handlers/application/menuhandler.go

@@ -2187,6 +2187,23 @@ func (h *MenuHandlers) resetIncorrectPINAttempts(ctx context.Context, sessionId
 	return nil
 }
 
+func (h *MenuHandlers) persistInitialLanguageCode(ctx context.Context, sessionId string, code string) error {
+	store := h.userdataStore
+	_, err := store.ReadEntry(ctx, sessionId, storedb.DATA_INITIAL_LANGUAGE_CODE)
+	if err == nil {
+		return nil
+	}
+	if !db.IsNotFound(err) {
+		return err
+	}
+	err = store.WriteEntry(ctx, sessionId, storedb.DATA_SELECTED_LANGUAGE_CODE, []byte(code))
+	if err != nil {
+		logg.ErrorCtxf(ctx, "failed to persist initial language code", "key", storedb.DATA_INITIAL_LANGUAGE_CODE, "value", code, "error", err)
+		return err
+	}
+	return nil
+}
+
 // persistLanguageCode persists the selected ISO 639 language code
 func (h *MenuHandlers) persistLanguageCode(ctx context.Context, code string) error {
 	store := h.userdataStore
@@ -2199,5 +2216,5 @@ func (h *MenuHandlers) persistLanguageCode(ctx context.Context, code string) err
 		logg.ErrorCtxf(ctx, "failed to persist language code", "key", storedb.DATA_SELECTED_LANGUAGE_CODE, "value", code, "error", err)
 		return err
 	}
-	return nil
+	return h.persistInitialLanguageCode(ctx, sessionId, code)
 }

store/db/db.go

@@ -59,6 +59,8 @@ const (
 	DATA_INCORRECT_PIN_ATTEMPTS
 	//ISO 639 code for the selected language.
 	DATA_SELECTED_LANGUAGE_CODE
+	//ISO 639 code for the language initially selected.
+	DATA_INITIAL_LANGUAGE_CODE
 )
 
 const (