This is an optimization for people that choose their table row highlighting to be inverse of the default Discourse theme.
If people choose to have the heading row (or individual th columns) and 'even' rows highlighted in topic-list.scss for the Categories page, the alternate coloring is not carried over to the User Activity page's Messages list. Because the basic-topic-list table there doesn't use the THEAD and TBODY wrappers, the first data row is effectively an 'odd' row, so highlighting is now applied both on the heading row and the first data row.
By adding the THEAD and TBODY wrappers, we make sure that the table structures across the app are the same and global row highlighting styles work out of the box also on the User Activity page.
BUGFIX: navigation bar should always activate the right tab (even when diging into a top period)
BUGFIX: /top pages titles
BUGFIX: no "edit category" button on /top page after visiting a category
BUGFIX: properly hide category columns when there is no children category (on both filter + top pages)
BUGFIX: promises not caught when scrolling down a topic list to load more of them
BUGFIX: CSS on category dropdowns
Updated `top_menu` i18n with available filters
