First of all, GoDaddy is one of the worst web hosts to use for Joomla. Your priority should be moving to a solid web host.
I would imagine your language file is already editable. Did you try using a file management extension like eXtplorer? If not, try that. It's free.
If you really do need to correct file ownerships or permissions and you do not know how or have proper access to make these type of changes, you will definitely need to contact the host. That's not something we can assist with.