enhancement: harmonize buttons in HDD GUI panel

Change label on Add Directory, to indicate it also supports archives.
Harmonize the widths of those buttons.
Improve label on CD select image file.

src/osdep/gui/PanelHD.cpp

@@ -366,24 +366,24 @@ void InitPanelHD(const config_category& category)
 		}
 	}
 
-	cmdAddDirectory = new gcn::Button("Add Directory");
+	cmdAddDirectory = new gcn::Button("Add Directory/Archive");
 	cmdAddDirectory->setBaseColor(gui_base_color);
 	cmdAddDirectory->setForegroundColor(gui_foreground_color);
-	cmdAddDirectory->setSize(cmdAddDirectory->getWidth() + 30, BUTTON_HEIGHT);
+	cmdAddDirectory->setSize(cmdAddDirectory->getWidth() + 5, BUTTON_HEIGHT);
 	cmdAddDirectory->setId("cmdAddDir");
 	cmdAddDirectory->addActionListener(hdAddActionListener);
 
 	cmdAddHardfile = new gcn::Button("Add Hardfile");
 	cmdAddHardfile->setBaseColor(gui_base_color);
 	cmdAddHardfile->setForegroundColor(gui_foreground_color);
-	cmdAddHardfile->setSize(cmdAddHardfile->getWidth() + 30, BUTTON_HEIGHT);
+	cmdAddHardfile->setSize(cmdAddDirectory->getWidth(), BUTTON_HEIGHT);
 	cmdAddHardfile->setId("cmdAddHDF");
 	cmdAddHardfile->addActionListener(hdAddActionListener);
 
 	cmdAddHardDrive = new gcn::Button("Add Hard Drive");
 	cmdAddHardDrive->setBaseColor(gui_base_color);
 	cmdAddHardDrive->setForegroundColor(gui_foreground_color);
-	cmdAddHardDrive->setSize(cmdAddHardDrive->getWidth() + 30, BUTTON_HEIGHT);
+	cmdAddHardDrive->setSize(cmdAddDirectory->getWidth(), BUTTON_HEIGHT);
 	cmdAddHardDrive->setId("cmdAddHardDrive");
 	cmdAddHardDrive->addActionListener(hdAddActionListener);
 
@@ -419,8 +419,8 @@ void InitPanelHD(const config_category& category)
 	cmdCDEject->setId("cmdCDEject");
 	cmdCDEject->addActionListener(cdButtonActionListener);
 
-	cmdCDSelectFile = new gcn::Button("Select Image");
-	cmdCDSelectFile->setSize(SMALL_BUTTON_WIDTH * 4, SMALL_BUTTON_HEIGHT);
+	cmdCDSelectFile = new gcn::Button("Select image file");
+	cmdCDSelectFile->setSize(SMALL_BUTTON_WIDTH * 6, SMALL_BUTTON_HEIGHT);
 	cmdCDSelectFile->setBaseColor(gui_base_color);
 	cmdCDSelectFile->setForegroundColor(gui_foreground_color);
 	cmdCDSelectFile->setId("cmdCDSelectFile");