hddmenu: Support ext4 for formating disk

- Support ext4 for formating disk (require /sbin/mkfs.ext4)
- Support ext4 for check disk (require /sbin/fsck.ext4 or /sbin/e2fsck)
- Display disk format in menu (require /sbin/blkid)
- 'ext4' and 'display disk format' disabled when required files not present


Origin commit data
------------------
Commit: 7c5d29a687
Author: Michael Liebmann <tuxcode.bbg@gmail.com>
Date: 2014-02-21 (Fri, 21 Feb 2014)

src/system/locals_intern.h

@@ -638,7 +638,7 @@ const char * locale_real_names[] =
 	"hdd_activate",
 	"hdd_check",
 	"hdd_check_failed",
-	"hdd_ext3",
+	"hdd_check_format_bad",
 	"hdd_extended_settings",
 	"hdd_fast",
 	"hdd_format",
@@ -649,7 +649,6 @@ const char * locale_real_names[] =
 	"hdd_middle",
 	"hdd_noise",
 	"hdd_not_found",
-	"hdd_reiser",
 	"hdd_removable_device",
 	"hdd_settings",
 	"hdd_sleep",
@@ -889,6 +888,7 @@ const char * locale_real_names[] =
 	"menu.hint_hdd",
 	"menu.hint_hdd_apply",
 	"menu.hint_hdd_check",
+	"menu.hint_hdd_fmt",
 	"menu.hint_hdd_format",
 	"menu.hint_hdd_noise",
 	"menu.hint_hdd_sleep",