Add captions to the text, title, table and datatable widgets with a link
to a new Filters section in the help popup.
This required:
- upgrading to angular ui bootstrap 1.3.3 to be able to set the focus on
a specific tab (see angular-ui/bootstrap/pull/5713)
- converting openHelp function to a directive
- adding a new directive to support angular directives and not just HTML
in the captions

Covers [BS-16403](https://bonitasoft.atlassian.net/browse/BS-16403)