Changing the text of Multisite Login Warning

Hello,
when a user wants to login into their subdomain blog from the main website they get the following warning text, before going to the subdomain:

"You attempted to access the "THe Website" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "WebTopik Sites" dashboard, please contact your network administrator.

If you reached this screen by accident and meant to visit one of your own sites, here are some shortcuts to help you find your way.
Your Sites
The website- Visit Dashboard | View Site"

Can anyone show me where I can edit this txt? What file is it located in...I would really appreciate it..Thank you in advance