change keyboard shortcuts; update tooltips

- "Load Track as Route" is now triggered by pressing `Shift-O`
- "Load No-Go-Areas" is now triggered by pressing `Shift-N`
- tooltip for navbar link is updated an ready for translation

js/plugin/TracksLoader.js

@@ -61,12 +61,12 @@ BR.tracksLoader = function (map, layersControl, routing, pois) {
         },
 
         _keydownListener: function (e) {
-            if (BR.Util.keyboardShortcutsAllowed(e) && e.keyCode === this.options.shortcut.open) {
-                if (e.shiftKey) {
-                    $('#loadNogos').modal('show');
-                } else {
-                    $('#navbarLoadTracks')[0].click();
-                }
+            if (
+                BR.Util.keyboardShortcutsAllowed(e) &&
+                e.keyCode === this.options.shortcut.open &&
+                false === e.shiftKey
+            ) {
+                $('#navbarLoadTracks')[0].click();
             }
         },
     });