Hints for radio buttons and checkboxes attached to only part of the label

[avernet]

Since 4.5 we support hints for radio buttons and checkboxes. In some cases, it might make sense for the hint to target a specific word(s) within the label, instead of the whole label. The image below shows how this could look like. This also means that there could be multiple hints for a given radio button or checkbox.

The main difficulties are related to the Form Builder UI where the hint is provided:

1. How form authors delimit the specific words in the label that are targeted by the hint?
2. How can they enter multiple hints per label?
3. How do they map the specific set of words selected in 1 to a hint message provided in 2?