Make boot options more consistent for live & installer images

kali-config/common/bootloaders/grub-pc/grub.cfg

@@ -3,15 +3,15 @@ source /boot/grub/config.cfg
 # Live boot
 LINUX_LIVE
 
-menuentry "Live system (forensic mode)" {
+menuentry "Live (forensic mode)" {
 	linux KERNEL_LIVE APPEND_LIVE noswap noautomount
 	initrd INITRD_LIVE
 }
-menuentry "Live system (persistence, check kali.org/prst)" {
+menuentry "Live USB Persistence              (check kali.org/prst)" {
 	linux KERNEL_LIVE APPEND_LIVE persistence
 	initrd INITRD_LIVE
 }
-menuentry "Live system (encrypted persistence, check kali.org/prst)" {
+menuentry "Live USB Encrypted Persistence    (check kali.org/prst)" {
 	linux KERNEL_LIVE APPEND_LIVE persistent=cryptsetup persistence-encryption=luks persistence
 	initrd INITRD_LIVE
 }
@@ -26,7 +26,7 @@ menuentry "Start installer with speech synthesis" {
 }
 fi
 
-submenu 'Advanced options...' {
+submenu 'Advanced options' {
 
 source /boot/grub/theme.cfg