MDL-41173  Change enrolenddate from "date_selector" to "date_time_selector"
MDL-44095 frontend: fix typos in readme file
MDL-44061 Ajax: Log whitespace issues to the server error log
MDL-44345 repository_youtube: Endless loop when reaching last results
MDL-44478 Javascript: Remove duplications in simpleyui rollup
MDL-44480 Javascript: Correct dialogue ID generation
MDL-32699 wiki: only edit capability is required to restore wiki revision
MDL-40721 wiki: missing page->set_url() when restoring wiki
MDL-43966 events: link to migration wiki in lib/upgrade.txt
MDL-44337 glossary: behat test for glossary categories
MDL-42870 completion: show failed activities as incompleted
MDL-42870 completion: performance and readability code refactoring
MDL-42368 Themes: Anomaly breadcrumb fix

Previously the editing button could become unreachable with small window
sizes.
MDL-43497 Language: Allow course language to be overridden
MDL-30085 core_grade: added a grade web service
MDL-30085 Fixing coding style
MDL-30085 Missing and invalid comments fixed
MDL-30085 Rename core_grade component references to core_grades

Also, change since tags from 2.6 to 2.7 and fixed invalid comments
MDL-30085 Added missing MOODLE_INTERNAL and MUST_EXISTS check
MDL-44497 quiz responses report : error when no attempts