refactor: move romaji overrides into dedicated modal, fix placeholders

src/main.js

@@ -47,6 +47,7 @@ import {
   _pickTheme,
   toggleInfoEdit, onInfoArtFile, autofillMusicBrainz, autofillItunes, saveMetadata, deleteSong,
   addRomajiOverrideUI, removeRomajiOverrideUI,
+  openRomajiOverridesModal, closeRomajiOverridesModal,
 } from './ui.js';
 
 // ─── CONNECT ───
@@ -325,6 +326,7 @@ Object.assign(window, {
   toggleMobileSearch, closeMobileSearch, switchSetupTab,
   toggleNotifPanel, deleteNotif, clearNotifs, _notifNavigate, _pickTheme,
   addRomajiOverrideUI, removeRomajiOverrideUI,
+  openRomajiOverridesModal, closeRomajiOverridesModal,
   // App
   doConnect, disconnect,
   // Audiobookshelf