This is a maintenance release including some minor bugs fixing and code improvements.

- fix getUsersFieldEntryData in lib.field.php for Country custom field
- #20153: fixed http protocol setting
- #20152: managed "Cancel" button
- fix lang
- fix performance exception
- fix test update modality
- Fix require path with static /../ in string.
- create 3.3.8 to insert in install ad upgrade lost query index
- Fix send Alert in subscription
- functions refactor
- fix question bank
- fix forma table rows when text is HTML
- add translation in folder view learning object status and action
- add color management in dashboardblock attendancegraph
- fix api deleteDay
- fix api updateDay
- fix upgrade sql
- #20146: added missing SQL instructions
- fix purchase user logic
- first commit for versioning
- fix course report duplicates
- fix remove dates
- fix certificate image
- fix certificate image
- fix registration with code
- fix dashboard permission