Hi Cliff,

My first note is that you should be creating tasks for tasks sake. It is mean to be a base table for other tables to inherit behaviors and attributes. If you try to create a new task, a list of other task types (called an interceptor) appears. If your other tables do not have a specific label for the comments field, it will inherit the label from task.

To answer your question, you are in the right place "Field Labels" on task with the Label and Plural fields being what will get displayed to the user in their preferred language.

http://wiki.servicenow.com/index.php?title=Field_Label_Help