[fr] follow #1479

3.0 corrects app/ to src/
[fr] follow #1480

correct /src/Plugin/ to /plugins/
[fr] follow #1484

Corrected doc for loading registry objects
[fr] update migration guide to follow en
[fr] follow en version for routing and tuto part two
[fr] follow #1487

3.0 typos and folder correction
[fr] follow en version for orm
[fr] follow #1491

Update global-constants-and-functions.rst
[fr] follow #1493

Update themes.rst
[fr] follow #1494

Update auth.rst
[fr] follow #1496

Update authentication.rst
[fr] follow #1497

Update Authentication tutorial
[fr] follow #1445

correct cronjob for 3.0
[fr] follow #1499

Update file-folder.rst
[fr] follow #1502

Update views.rst
[fr] follow #1503

Removed not needed 'foreach' in 'Elements' section
[fr] follow remove of CacheHelper
[fr] follow def946a

Refs cakephp/cakephp#4071