Fix translation strings not found

The translation context doesn't exist, so the translations were not found, fixed
now.
Closes #8829.

src/base/search/searchpluginmanager.cpp

@@ -62,18 +62,6 @@ namespace
 
 QPointer<SearchPluginManager> SearchPluginManager::m_instance = nullptr;
 
-const QHash<QString, QString> SearchPluginManager::m_categoryNames {
-    {"all", QT_TRANSLATE_NOOP("SearchEngine", "All categories")},
-    {"movies", QT_TRANSLATE_NOOP("SearchEngine", "Movies")},
-    {"tv", QT_TRANSLATE_NOOP("SearchEngine", "TV shows")},
-    {"music", QT_TRANSLATE_NOOP("SearchEngine", "Music")},
-    {"games", QT_TRANSLATE_NOOP("SearchEngine", "Games")},
-    {"anime", QT_TRANSLATE_NOOP("SearchEngine", "Anime")},
-    {"software", QT_TRANSLATE_NOOP("SearchEngine", "Software")},
-    {"pictures", QT_TRANSLATE_NOOP("SearchEngine", "Pictures")},
-    {"books", QT_TRANSLATE_NOOP("SearchEngine", "Books")}
-};
-
 SearchPluginManager::SearchPluginManager()
     : m_updateUrl(QString("http://searchplugins.qbittorrent.org/%1/engines/").arg(Utils::Misc::pythonVersion() >= 3 ? "nova3" : "nova"))
 {
@@ -307,7 +295,18 @@ SearchHandler *SearchPluginManager::startSearch(const QString &pattern, const QS
 
 QString SearchPluginManager::categoryFullName(const QString &categoryName)
 {
-    return tr(m_categoryNames.value(categoryName).toUtf8().constData());
+    static const QHash<QString, QString> categoryTable {
+        {"all", tr("All categories")},
+        {"movies", tr("Movies")},
+        {"tv", tr("TV shows")},
+        {"music", tr("Music")},
+        {"games", tr("Games")},
+        {"anime", tr("Anime")},
+        {"software", tr("Software")},
+        {"pictures", tr("Pictures")},
+        {"books", tr("Books")}
+    };
+    return categoryTable.value(categoryName);
 }
 
 QString SearchPluginManager::pluginFullName(const QString &pluginName)

src/base/search/searchpluginmanager.h

@@ -111,7 +111,6 @@ private:
     static QString pluginPath(const QString &name);
 
     static QPointer<SearchPluginManager> m_instance;
-    static const QHash<QString, QString> m_categoryNames;
 
     const QString m_updateUrl;