Special Characters Issue

Hello,
I have a small problem with special characters in my wordpress.
I am trying to have a menu that will display characters such as “?” in my menu. Menu is created simply with css and added to .php file. Instead of those characters I see “?” for example etc.

Anyone knows this issue?
I am sure it is character encoding problem. I have an enlish version installed.

Oh yes and I also added a language package into languages folder, and edit it in config file.

Thank you
Mar.