enhance(frontend): プラグインのソースコードを確認・コピーできるように (#11873)

* (add) plugin: view and copy source code

* (fix) plugin permission ui

* Update Changelog

locales/index.d.ts

@@ -1632,6 +1632,7 @@ export interface Locale {
         "install": string;
         "installWarn": string;
         "manage": string;
+        "viewSource": string;
     };
     "_preferencesBackups": {
         "list": string;