1. Add/Convert a help entry for the dialog itself.
There are typically two entries already here, one for the UI
entry, and one for the associated uno command,
convert the UI entry (or if the uno one is duplicated pick
one of the duplicated ones) to
hid/path/to/ui-without-suffix/<DIALOG-NAME>
i.e. hid/svx/ui/chineseconversiondialog/ChineseConversionDialog
2. replace all other per-widget hid entries with path/to/ui-without-suffix/<WIDGET-NAME>
unfortunately there are none in this specific example, but you
get the picture.
2.1. There are no explicit help-ids in .uis, they are identified
by their .ui unique widget name within the also unique .ui path