Fix for #6215 Added a "learn more" link on "Others" row in reports

This is a fix for #6215 

When not hovering the row (no change):

![normal](https://cloud.githubusercontent.com/assets/720328/4554027/9ea96ac8-4ea5-11e4-984f-874a1b672697.png)

When hovering the row (new link):

![hover](https://cloud.githubusercontent.com/assets/720328/4554030/a9f56422-4ea5-11e4-9c02-8c8b9039e02f.png)

*(don't mind the translation)*

To achieve this I added a new method `handleSummaryRow()` in `dataTable.js` I hope it makes sense. If not, let me know.