Use a field to store the original title (probably caption)

[Erwan Moreau]

Otherwise the tasks titles will have numbers.

[Erwan Moreau]

in ui/todo/TodoItem.tid when the task is printed in the list, ui/todo/TodoCaption is called. ui/todo/TodoCaption contains only

<$view field="title"/>

and is clearly meant precisely to adjust to a different field if needed.