You can try to edit the grub2 source code to modify those strings (Header,Footer etc).

NOTE: I recommend you to do this in a Virtual Machine or in a Test Machine to see is everything is OK. (In this example I'm running Ubuntu 12.04 with grub2 1.99-21ubuntu3.10).

1) Make sure you have enable the Source code repository.

• Open the Ubuntu Software Center.


• In the Menu Bar choose Edit -> Software Sources. Click to enable "Source code repository".
  Just in case I use the "Main Server" to Download.

Open a Terminal window Ctrl+Alt+T and type:

• sudo apt-get update

2) In the Terminal type the following to install the necessary packages.

• sudo apt-get install build-essential quilt

3) Install build dependencies.

• sudo apt-get build-dep grub2

4) Create a folder to download the source code.

• mkdir ~/Downloads/src

  
  



• cd ~/Downloads/src

  
  

5) Download the source code & Export variables.

• apt-get source grub2

  
  



• export QUILT_PATCHES=debian/patches

  
  



• export EDITOR=gedit

  
  

6) Create the patch and edit the source code.

• cd grub2-1.99

  
  



• quilt new 99_custom-header-footer.patch

  
  

Edit the main.c file

• quilt edit grub-core/normal/main.c

As an example I changed the line 214

From:

  const char *msg = _("GNU GRUB  version %s");

To:

  const char *msg = _("My Custon Grub Title");

Edit the menu_text.c file

• quilt edit grub-core/normal/menu_text.c

Edit the "Strings" (Pink Color) According to your needs.

Only as an example I changed the lines 159 & 160

From:

  const char *msg = _("Use the %C and %C keys to select which "

          "entry is highlighted.

");

To:

      const char *msg = _("You can write a text message here according 

to your needs...

");

And the lines 187 to 189

From:

(_("Press enter to boot the selected OS, "

   "'e' to edit the commands before booting "

   "or 'c' for a command-line.

"),

To:

        (_("You can put a message here... to press 

a key to boot the OS.

Or a Help text... etc."),

7) Build the deb packages.

• quilt refresh


• fakeroot dpkg-buildpackage

NOTE: This may take awhile.

8) Install the deb packages.

• cd ..

  
  



• sudo dpkg -i grub-pc*.deb grub2-common*.deb

  
  

9) Finally you can Restart your machine to see the changes.

Before:

After:

Hope this helps.