Issue #1986408 by LewisNyman, oresh: Message style update.

core/includes/authorize.inc

core/includes/theme.inc

core/misc/progress.js

core/misc/tabledrag.js

...les/block/lib/Drupal/block/Plugin/views/display/Block.php

...dules/field_ui/lib/Drupal/field_ui/Form/FieldEditForm.php

core/modules/file/file.js

core/modules/system/system.theme-rtl.css

core/modules/system/system.theme.css

...modules/views/lib/Drupal/views/Plugin/views/query/Sql.php

...dules/views/lib/Drupal/views/Plugin/views/style/Table.php

...s/views_ui/lib/Drupal/views_ui/ViewEditFormController.php

core/update.php