Author: Andrew Robert Nicols
MDL-30617 Adjustments to styling of module chooser
These changes fix several points and suggested changes:
* increase the size of the help popup to 800x600
* fix issues with centering of the dialogue
* swap next/cancel buttons
* convert next button to use string for 'Add'
* convert add text to 'Add an activity or resource'
http://git.moodle.org/gw?p=moodle.git;a=commit;h=af75421c546b47934f02595b99e51e57c4b02e14
http://github.com/moodle/moodle/commit/af75421c546b47934f02595b99e51e57c4b02e14
+ 2.3 en [addresourceoractivity,core]