enhancement file delete

Can delete local image/other files only from *md directory.

Bugfix for lang on img

v1.2.1

bug fix, lang on img/file

Multi-language upgrade

Language pages for each route can be selected, edited, and saved edits previewed.

Frontend editing visualisation

Edits can be seen by separately authorised users without giving them Admin permissions.

Initial publication

Grav plugin for front-end editing by authorised users of md pages