Soldier: with that many, what I would do is to print the log of your chats (i.e. just do a printscreen to show the messages that were sent and the date, but not the actual content). That will show them how often you correspond. Then I would print a selection of your chats in Spanish. I wouldn't bother to translate them because as you said you will go broke doing that. Also, unless you are doing an inland application, your application will be processed in the visa office for your country where presumably they speak Spanish and the officers will understand the content. Good luck!