Add <label> to checkbox texts (specially for those used a lot)

most if not all radios/checkboxes don't have a tag attached to them, so that you can not click the text of the checkbox/radio, but need to click on the checkbox.

Fix is easy: add an id to the and add a for the id around the text.

It will improve usability and accessibility. :-)

As example, see the "Notify me whenever this task changes" below this box when typing a new task in this tracker: when you click on text, it changes the checkbox state.

Nothing major, just a little anoying.