Selettore lingua (System/EN/IT) nelle impostazioni con QTranslator in main.cpp (pattern quill); fix 'Close book' con pop fino alla prima pagina

src/main.cpp

@@ -2,6 +2,7 @@
 #include <QGuiApplication>
 #include <QQuickView>
 #include <QQmlContext>
+#include <QTranslator>
 #include <sailfishapp.h>
 
 #include "apiclient.h"
@@ -12,13 +13,36 @@
 Q_DECL_EXPORT int main(int argc, char *argv[])
 {
     QGuiApplication *app = SailfishApp::application(argc, argv);
+
+    Settings settings;
+
+    // User-chosen language (Settings -> Language). "system" = Sailfish UI
+    // language (libsailfishapp already installed its translator). "en" =
+    // force English (remove all translators). "it" = force Italian.
+    const QString lang = settings.language();
+    if (lang == "en" || lang == "it") {
+        const QList<QTranslator *> trs = app->findChildren<QTranslator *>();
+        foreach (QTranslator *t, trs) {
+            app->removeTranslator(t);
+            t->deleteLater();
+        }
+        if (lang == "it") {
+            QTranslator *translator = new QTranslator(app);
+            if (translator->load(QStringLiteral("harbour-calibreweb_it"),
+                                 QStringLiteral("/usr/share/translations"))) {
+                app->installTranslator(translator);
+            } else {
+                qWarning() << "harbour-calibreweb: cannot load harbour-calibreweb_it.qm";
+            }
+        }
+    }
+
     QQuickView *view = SailfishApp::createView();
 
     qDebug() << "harbour-calibreweb v0.2.0 build" << __DATE__ << __TIME__;
 
     qmlRegisterType<EpubBook>("harbour.calibreweb", 1, 0, "EpubBook");
 
-    Settings settings;
     ApiClient apiClient(&settings);
     Downloader downloader(&settings);