Update bip-0038.mediawiki

Fix some erroneous statements in the description of the math used for encryption/decryption of EC-Multiplied keys/addresses
Add test case for UTF8 NFC normalization
Add normalization note on test case
Attempt to put the actual characters in the source file
Merge pull request #29 from MidnightLightning/patch-1

Update bip-0038.mediawiki