MDL-46457 mod_lti: Render lti description through standard format_module_intro
MDL-46620 messages Make sure full message is used for read marking

message_mark_message_read needs to have the full message object,
otherwise data will be lost.
Automatically generated installer lang files
Merge branch 'MDL-46620-26' of https://github.com/merrill-oakland/moodle into MOODLE_26_STABLE
Merge branch 'MDL-46457_26' of git://github.com/aolley/moodle into MOODLE_26_STABLE
MDL-44794 group: unit test for groups_get_user_groups method.
MDL-44794 group: unit test for get_groups method.
Merge branch 'MDL-44794-26' of git://github.com/lameze/moodle into MOODLE_26_STABLE
MDL-44149 Assign: Reopen attempts from quick grading (reopenuntilpass)

Conflicts:
	mod/assign/locallib.php
Merge branch 'MDL-44149-26' of git://github.com/damyon/moodle into MOODLE_26_STABLE
MDL-46625 theme: Added a way to target the current page
Merge branch 'install_26_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_26_STABLE
weekly release 2.6.4+
MDL-46496 JS: Replace jQuery UI 1.10.3 minified CSS

The original version contained some invalid paths for images. I'm unsure
where these came from as the version from the offical jQuery UI does not
contain these, and these were the only differences in the files.