Assigned the 'effects_and_compositions' folder

@jlskuz: In order to avoid duplications I inform you that I will create an MR with fixes from my translation work:

An example:

see also `Frei0r-alphagrad readme http://www.piksel.no/trac/browser/src/filter/alpha0ps/readme`_ file.

as

see also `Frei0r readme https://github.com/dyne/frei0r/blob/master/src/filter/alpha0ps/readme`_ file.

The web is: https://frei0r.dyne.org/ and Git repo is: https://github.com/dyne/frei0r/

I would not be bad to send these assignments to translators. I have your approval?