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Add pt_PT.text to INSTALL/grub/help/

new lines was translated

Hotkey m is for calculate checksum and print the result.
If also exist a .md5/.sha1/.sha256/.sha512 file, then it will check the result with the value in the file.
The .md5/.sha1/.sha256/.sha512 suffix is appended to the original file name not replace the original suffix.
For example:
/ISO/Ubuntu-20.04-amd64-desktop.iso
/ISO/Ubuntu-20.04-amd64-desktop.iso.md5

Mater @ventoy 
I translated English help file to Turkish language...Can you add this file?

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