Release Candidate

	modified:   lang/de/local_course_overview_ext.php
	modified:   lang/en/local_course_overview_ext.php
	modified:   lib.php
	new file:   patches/MOODLE_27.patch
Added/updated patch files and README

	modified:   README.md
	modified:   patches/MOODLE_27.patch
	new file:   patches/MOODLE_28.patch