ShellPkg: fix UNI string formatting and line endings to match UNI Spec

Changes include:
* Added missing \r\n line endings inside string literals
* Fixed inconsistent indentation in multi-line string entries
* Removed duplicated #language en-US directive
* Aligned string formatting to match the UNI specification

Updated files:
ShellPkg/DynamicCommand/HttpDynamicCommand/Http.uni
ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni

The issues were identified during testing of the parser
https://github.com/xpahos/edk2-idea.

Signed-off-by: Alexander Gryanko <xpahos@gmail.com>