Better layout for single, and multi-line pagination.

[#64688658] "Change size of navigation bar to accommodate a second row
of page numbers as necessary."

https://www.pivotaltracker.com/story/show/64688658
Some fixes for navigation menu &  old MW-theme for more than 10+ pages.

(pagination MW theme)

[#64688658] "Change size of navigation bar to accommodate a second row
of page numbers as necessary."

https://www.pivotaltracker.com/story/show/64688658