[WIP][ticket/12813] Improve responsive pagination alignment and page-jump fixes

1. Fix incorrect title attribute on page-jump input element
2. Remove empty value attribute on page-jump input element
3. Use input type="number" for page-jump
4. Reduce the number of page elements in the topic-row pagination
5. Reposition topic-row pagination on the same line as "replies", thereby giving more room to the last-post info.

https://tracker.phpbb.com/browse/PHPBB3-12813
I opted for this due to a FF bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1024078

![spinner](https://cloud.githubusercontent.com/assets/3015760/3488592/4a3c0bb8-04f3-11e4-9951-49d370db7093.jpg)

But I guess it will be fixed eventually, so there won't really be need for this.