[Update/Refactor] Subtitle system v1.1. Organize file system and change the design.

src-ui/app/App.jsx

@@ -21,6 +21,8 @@ import { SnackbarController } from "./snackbar_controller/SnackbarController";
 import styles from "./App.module.scss";
 import { useIsBackendReady, useIsSoftwareUpdating, useIsVrctAvailable, useWindow } from "@logics_common";
 
+import { SubtitlesController } from "./main_page/main_section/subtitle_system_container/_controllers/subtitlesController.jsx";
+
 export const App = () => {
     const { currentIsVrctAvailable } = useIsVrctAvailable();
     const { currentIsBackendReady } = useIsBackendReady();
@@ -53,6 +55,8 @@ const Contents = () => {
     const { currentIsSoftwareUpdating } = useIsSoftwareUpdating();
     return (
         <>
+            <SubtitlesController />
+
             <WindowTitleBar />
             {currentIsSoftwareUpdating.data === false
             ?