Semantic markup: use E() in more places (#6699)
Use semantic markup.
(cherry picked from commit 7ae8cc9902)
Co-authored-by: Felix Fontein <felix@fontein.de>
* added utf-8 markers to all .py files in plugins/filter
* added utf-8 markers to all .py files in plugins/inventory
* added utf-8 markers to all .py files in plugins/lookup
* callback_type -> type.
* Mark authors as unknown.
* Add author field forgotten in #627.
* Fix author entries.
* Add author field forgotten in #127.
* Fix some types.