Add "Open Folder" context menu option

Added an option to open the zim's location in the OS's file manager

resources/i18n/en.json

@@ -148,5 +148,6 @@
     "open-book": "Open book",
     "download-book": "Download book",
     "pause-download": "Pause download",
-    "resume-download": "Resume download"
+    "resume-download": "Resume download",
+    "open-folder": "Open folder"
 }

src/contentmanager.cpp

@@ -21,6 +21,7 @@
 #include "kiwixconfirmbox.h"
 #include <QtConcurrent/QtConcurrentRun>
 #include "contentmanagerheader.h"
+#include <QDesktopServices>
 
 ContentManager::ContentManager(Library* library, kiwix::Downloader* downloader, QObject *parent)
     : QObject(parent),
@@ -99,6 +100,7 @@ void ContentManager::onCustomContextMenu(const QPoint &point)
     QAction menuPauseBook(gt("pause-download"), this);
     QAction menuResumeBook(gt("resume-download"), this);
     QAction menuCancelBook(gt("cancel-download"), this);
+    QAction menuOpenFolder(gt("open-folder"), this);
 
     if (bookNode->isDownloading()) {
         if (bookNode->getDownloadInfo().paused) {
@@ -110,8 +112,14 @@ void ContentManager::onCustomContextMenu(const QPoint &point)
     } else {
         try {
             const auto book = KiwixApp::instance()->getLibrary()->getBookById(id);
+            auto bookPath = QString::fromStdString(book.getPath());
             contextMenu.addAction(&menuOpenBook);
             contextMenu.addAction(&menuDeleteBook);
+            contextMenu.addAction(&menuOpenFolder);
+            connect(&menuOpenFolder, &QAction::triggered, [=]() {
+                QFileInfo fileInfo(bookPath);
+                QDesktopServices::openUrl(fileInfo.absoluteDir().absolutePath());
+            });
         } catch (...) {
             contextMenu.addAction(&menuDownloadBook);
         }