Changes in applicable_formats to make it compatible with Moodle 3.x internal plugin checks during upgrades.

Add lang strings for the capabilities
Compatible for Moodle 2.2 to 3.1

Remove final ?>

 - Correct a crash when editing an existing dictionary block
New features:
 + The pop up dictionary can now open in a real popup instead of the browser tab
 + Add a parameter to the URL to put the word in any place of the URL.