There are three tabs within the "General" tab, and Windows is the first. If you are only compiling for WinHelp then the only field you will be interested in is the Title field. The other two caption fields refer to HtmlHelp button options. Although the caption options are rarely used they are included here for thoroughness.
As with the other translation tabs, you see a list of items on your left, the Window names. They do not need translating, but as you select each one the Titles and captions will appear on the right. Translate any text in the Translation section and click the green translation icon for each one.