Adding a tooltip in URL Field directive version

- HTML template updated to provide tooltip for use of validate url checkbox
- Directive updated to inject tooltip component
- translation.json updated to provide tooltip copy
- e2e test HTML for URL Field updated to import angular ui-bootstrap and tooltip component
[fix] Changed heading i8n value for table

Removed column-setting css as it's been added to common-style
Merge pull request #120 from alex-deaconu/fix/table-18n

Fix/table 18n
Merge pull request #121 from stulees/master

Adding a tooltip in URL Field directive version