[ticket/12853] Change navbar ACP from skip- to last-responsive

PHPBB3-12853
[ticket/12845] Remove invalid ARIA role for breadcrumbs

PHPBB3-12845
Merge pull request #2740 from PayBas/ticket/12845

[ticket/12845] Fix invalid ARIA role for breadcrumbs

* PayBas/ticket/12845:
  [ticket/12845] Remove invalid ARIA role for breadcrumbs
Merge pull request #2739 from PayBas/ticket/12853

[WIP][ticket/12853] Change navbar ACP from skip- to last-responsive

* PayBas/ticket/12853:
  [ticket/12853] Change navbar ACP from skip- to last-responsive
[ticket/12857] Add template events breadcrumbs_before/after

PHPBB3-12857
[ticket/12857] Add missing template events breadcrumb_prepend

To insert links after site-home

PHPBB3-12857