Rename "Screen" tab to "Display"

This is what pretty much everyone else calls these kind of settings, so
let's change so users feel familiar.

vncviewer/OptionsDialog.cxx

     createCompressionPage(tx, ty, tw, th);
     createSecurityPage(tx, ty, tw, th);
     createInputPage(tx, ty, tw, th);
-    createScreenPage(tx, ty, tw, th);
+    createDisplayPage(tx, ty, tw, th);
     createMiscPage(tx, ty, tw, th);
   }
 
     if (!strcmp(getMenuKeySymbols()[i].name, menuKeyBuf))
       menuKeyChoice->value(i + 1);
 
-  /* Screen */
+  /* Display */
   if (!fullScreen) {
     windowedButton->setonly();
   } else {
     menuKey.setParam(menuKeyChoice->text());
   }
 
-  /* Screen */
+  /* Display */
   if (windowedButton->value()) {
     fullScreen.setParam(false);
   } else {
 }
 
 
-void OptionsDialog::createScreenPage(int tx, int ty, int tw, int th)
+void OptionsDialog::createDisplayPage(int tx, int ty, int tw, int th)
 {
-  Fl_Group *group = new Fl_Group(tx, ty, tw, th, _("Screen"));
+  Fl_Group *group = new Fl_Group(tx, ty, tw, th, _("Display"));
 
   tx += OUTER_MARGIN;
   ty += OUTER_MARGIN;

vncviewer/OptionsDialog.h

   void createCompressionPage(int tx, int ty, int tw, int th);
   void createSecurityPage(int tx, int ty, int tw, int th);
   void createInputPage(int tx, int ty, int tw, int th);
-  void createScreenPage(int tx, int ty, int tw, int th);
+  void createDisplayPage(int tx, int ty, int tw, int th);
   void createMiscPage(int tx, int ty, int tw, int th);
 
   static void handleAutoselect(Fl_Widget *widget, void *data);
   Fl_Check_Button *systemKeysCheckbox;
   Fl_Choice *menuKeyChoice;
 
-  /* Screen */
+  /* Display */
   Fl_Round_Button *windowedButton;
   Fl_Round_Button *currentMonitorButton;
   Fl_Round_Button *allMonitorsButton;

vncviewer/parameters.cxx

   &compressLevel,
   &noJpeg,
   &qualityLevel,
-  /* Screen */
+  /* Display */
   &fullScreen,
   &fullScreenMode,
   &fullScreenSelectedMonitors,