I have a site with the default language as English. I am using the q translate plugin so that visitors can translate it to French or Croatian. The Croatian language file has to be added. I'm not sure what I need to do. I know I have to download the .mo file. How/where do I install it? Also it says to change the define ('WPLANG', ''); to a language but doesn't that change the default language - that's not what I want to do. I want to have English as the default with options for French, Croatian, etc.