MDL-44590 category: correct get_string component
MDL-44590 behat: Add test for course category idnumber duplication
MDL-43960 assign: Add missing include

There was a report of mod_assign_save_grade webservice failing because of this.
I couldn't reproduce it, but grepping the code found one place where this include
should be added.
MDL-44573: Remove HTML tags in outputs column in offline grading worksheet
MDL-43985 Assign: Allow teachers to skip notifying students about grade update.

backport of MDL-33600
MDL-41285 block_recent_activity: behat test for structural changes
MDL-44686 behat: limit failure filename length to 255 chars
MDL-44665 declare all quiz page types in the blocks UI.
Merge branch 'MDL-43960-26' of git://github.com/damyon/moodle into MOODLE_26_STABLE
MDL-44670 theme_clean: Updating screenshot
Merge branch 'MDL-44665_26' of git://github.com/timhunt/moodle into MOODLE_26_STABLE
Merge branch 'mdl44573-moodle26' of git://github.com/tlock/moodle into MOODLE_26_STABLE
Merge branch 'wip-MDL-41285-m26' of git://github.com/marinaglancy/moodle into MOODLE_26_STABLE
Merge branch 'wip-MDL-44686-m26' of git://github.com/marinaglancy/moodle into MOODLE_26_STABLE
MDL-44822 assignfeedback_editpdf: Stop test generation in is_enabled()

This change also moves one of the checks in test_gs_path. If
generateimage is false, there's no need to stat for the fixture file.
Automatically generated installer lang files
MDL-43284 Theme: Clean theme errors with padding in Question Bank fixed
MDL-44824 add missing subplugin type names
MDL-44824 add missing subplugin type names
MDL-44701 gradereport_grader: Display warning on navigation if unsaved grades are present