Update reCaptcha.php

* Change section for extension registration
* Provide description for extension registration
* Provide license for extension registration
Update ru.json

Add description message still to be translated
Update en.json

Add extension description
Update qqq.json

* Add extension description
* Tweak message
Create de.json

Provide German translations
Create COPYING

Provide license
Update composer.json

* Tweak description
* Add minimum PHP version
* Move link to https
Merge pull request #1 from kghbln/patch-1