MDL-42953 Themes: Fixing CSS for headers of central blocks
MDL-33763 notes: Fix issue with incorrect node highlighting in the nav tree
MDL-44098: Late submissions with extension calculate period of lateness incorrectly
MDL-44620 behat: Automates MDLQA-6

- MDLQA-6: By default, a new course contains a news
forum in which only teachers can post and subscription
is forced
MDL-44620 behat: Automate MDLQA-7

- MDLQA-7: By default, a new course contains a Latest
News block which displays a specific number of recent
discussions from the news forum
MDL-18162 mod_forum: Correct phpdoc for forum_clean_search_terms
MDL-45592 mod_feedback - unwanted linebreak after import or duplicating a feedback
MDL-45333 output: navbar is now wrapped in a <nav> tag
MDL-45726 SCORM: Correct check for forcenewattempt
Automatically generated installer lang files
Automatically generated installer lang files
MDL-45781 quiz autosave: detect and report when the session is lost.

and also other errors.
MDL-35514 mod_forum: Fixed warning message to students in forums with groups
Merge branch 'MDL-33763-26' of git://github.com/ankitagarwal/moodle into MOODLE_26_STABLE
Merge branch 'm26_MDL-45726' of https://github.com/danmarsden/moodle into MOODLE_26_STABLE
Merge branch 'MDL-18162-26' of git://github.com/andrewnicols/moodle into MOODLE_26_STABLE
Merge branch 'MDL-45781_26' of git://github.com/timhunt/moodle into MOODLE_26_STABLE
Merge branch 'm26_MDL-44098' of git://github.com/greg-or/moodle-mod_assign into MOODLE_26_STABLE
Merge branch 'MDL-45592_26' of git://github.com/grabs/moodle into MOODLE_26_STABLE
Merge branch 'MDL-42953-26' of git://github.com/phalacee/moodle into MOODLE_26_STABLE