NormalizeString POD Fixing and variable renaming

NormalizeString POD Fixing and variable renaming

    POD was mistakenly telling that NFD was supposed to be the default
    encoding.  In fact, it is not, it is NFC.
    So the variable $nfc to change to the not default encoding was misleading.
    Renaming it into $nfd

(written by hdl)

Refactored by Chris Cormack

Signed-off-by: Davi <davi@gnu.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 4117b293f633597e74e3dda9e1e52810d31ad23d)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>