Saner keyboard layouts for Arabic and Russian.

Both us and ara/ru are added, defaulting to us. This is how Ubuntu
does it, for the record.

config/binary_local-hooks/20-syslinux_i18n

@@ -63,7 +63,7 @@ for LANG_CODE in ${AMNESIA_SUPPORTED_LANGUAGES}; do
    case "${LANG_CODE}" in
       ar)
 	 LANG_NAME='^Arabic'
-	 LANG_APPEND='locales=ar_EG.UTF-8'
+	 LANG_APPEND='locales=ar_EG.UTF-8 keyboard-layouts=us,ara'
 	 ;;
       de)
 	 LANG_NAME='^German'
@@ -91,7 +91,7 @@ for LANG_CODE in ${AMNESIA_SUPPORTED_LANGUAGES}; do
 	 ;;
       ru)
 	 LANG_NAME='^Russian'
-	 LANG_APPEND='locales=ru'
+	 LANG_APPEND='locales=ru keyboard-layouts=us,ru'
 	 ;;
       zh)
 	 LANG_NAME='^Chinese'