Tooltips bugs in module sequence footer content when they are too big

Hi

Today I'm offering a new bug report and a very quick fix concerning tooltips that show up when you put your mouse over previous/next buttons in module sequence footer content. 

### :1234: Test plan
* Create a course, and 3 pages,
* Put very, very long titles for thoses pages, like this one: "I am a very long title for a very interesting content, and I have to be detailed so that people really get why I am the title of this content" (<= this one should be long enough), 
* Then create a module and add those 3 pages as module items,
* Don't forget to publish the pages if you have the draft state enabled,
* Finally, enter the second page, and put your mouse over previous/next button
* You should see a very big tooltip that shows up over the buttons and prevent users from clicking on them (as the tooltips catch the click)

### :ballot_box_with_check: The fix
My fix is quite easy, I did a little bit of investigation and found that we can specify the position of the tooltip. Instead of the "top" default, I put right, for the previous button and left for the next button so that those tooltips no longer bother people when they want to click on those buttons. 

I did not put right for the next button to prevent the tooltip from showing up outside of small screens. 

I hope this quick fix will be accepted, :blush:

Kulgar.