BrowserActivity: close drawers on back/forward btns

and update italian translations

app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java

@@ -1884,6 +1884,7 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         if (currentTab != null) {
             if (currentTab.canGoBack()) {
                 currentTab.goBack();
+                closeDrawers(null);
             } else {
                 mPresenter.deleteTab(mTabsManager.positionOf(currentTab));
             }
@@ -1896,6 +1897,7 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         if (currentTab != null) {
             if (currentTab.canGoForward()) {
                 currentTab.goForward();
+                closeDrawers(null);
             }
         }
     }

app/src/main/res/values-it/strings.xml

@@ -220,6 +220,7 @@
     <string name="action_add_to_homescreen">Aggiungi a schermata Home</string>
     <string name="message_added_to_homescreen">Scorciatoia aggiunta</string>
     <string name="action_delete_all_bookmarks">Cancella tutti i segnalibri</string>
+    <string name="swap_bookmarks_and_tabs">Inverti pannello segnalibri con schede</string>
 
     <string name="faq">FAQ</string>
     <string name="faq_description">Domande più frequenti</string>