live/bootloader: add live system language selection in UEFI bootloader (GRUB)

- fixes #38

config/bootloaders/grub-pc/grub.cfg

@@ -0,0 +1,64 @@
+set default=0
+
+loadfont $prefix/dejavu-bold-16.pf2
+loadfont $prefix/dejavu-bold-14.pf2
+loadfont $prefix/unicode.pf2
+set gfxmode=auto
+insmod all_video
+insmod gfxterm
+insmod png
+
+set color_normal=light-gray/black
+set color_highlight=white/black
+
+if [ -e /isolinux/splash.png ]; then
+    # binary_syslinux modifies the theme file to point to the correct
+    # background picture
+    set theme=/boot/grub/live-theme/theme.txt
+elif [ -e /boot/grub/splash.png ]; then
+    set theme=/boot/grub/live-theme/theme.txt
+else
+    set menu_color_normal=cyan/blue
+    set menu_color_highlight=white/blue
+fi
+
+terminal_output gfxterm
+
+insmod play
+play 960 440 1 0 4 440 1
+
+# Live boot
+LINUX_LIVE
+
+# You can add more entries like this
+# menuentry "Alternate live boot" {
+# linux KERNEL_LIVE APPEND_LIVE custom options here
+# initrd INITRD_LIVE
+# }
+# menuentry "Alternate graphical installer" {
+# linux KERNEL_GI APPEND_GI custom options here
+# initrd INITRD_GI
+# }
+# menuentry "Alternate textual installer" {
+# linux KERNEL_DI APPEND_DI custom options here
+# initrd INITRD_DI
+# }
+menuentry "Live system (French)" {
+linux KERNEL_LIVE APPEND_LIVE locales=fr_FR.UTF-8
+initrd INITRD_LIVE
+}
+
+
+
+# Installer (if any)
+LINUX_INSTALL
+
+submenu 'Advanced options...' {
+
+# More installer entries (if any)
+LINUX_ADVANCED_INSTALL
+
+# Memtest (if any)
+MEMTEST
+
+}