GitLab

* grub/help/en_US: Fix typos

* Apply suggestions from code review

* Fix typo in line 15

1. Change F1 from Memdisk to help
2. Add d/Ctrl+d for Memdisk
3. Add L for Language selection

So update the help txt files and menu json files at the same time.

support to browse and boot files in local disk.

2. Add VTOY_HELP_TXT_LANGUAGE option in Global Control plugin
3. Add Ctrl+m hotkey for file cheksum