Merge remote-tracking branch 'origin/8.x' into 8.x-file-config

core/includes/common.inc

core/includes/session.inc

core/misc/autocomplete.js

core/modules/book/book.module

core/modules/book/book.pages.inc

core/modules/book/book.test

core/modules/comment/comment.module

core/modules/field/modules/list/list.module

core/modules/field/modules/text/text.test

core/modules/forum/forum.module

core/modules/locale/locale.admin.inc

core/modules/locale/locale.api.php

core/modules/locale/locale.module

core/modules/locale/locale.test

core/modules/node/content_types.inc

core/modules/node/node.install

core/modules/node/node.pages.inc

core/modules/overlay/overlay-parent.js

core/modules/path/path.test

core/modules/poll/poll.test