MDL-35934 Filemanager: add aria attributes for editing file/folder.
Add unique reference ids

Conflicts:

	files/renderer.php
	mod/data/field/file/field.class.php
	mod/data/field/picture/field.class.php
MDL-35934 Filemanager: update set focus attribute.
Also limit the display string for the dialog header to fit nicely on mobile devices
MDL-35934 filemanager: Add new string for edit