MDL-43319 phpdoc: fix too much ham consumption by developers
MDL-45376 Completion: Form locking is still not working right

On submit of the form, it called 'freeze' on the completion-related
fields (even though they shouldn't have been frozen because you
already clicked the unlock button).
Automatically generated installer lang files
MDL-45342 book: Automate MDLQA-2423 - A teacher can create book chapters and subchapters
MDL-44174 theme_clean: Updating information in readme file
MDL-34904 lti: Fix notice while using lti in frontpage
MDL-45127 mod_lesson: Updated question edit screen with more help text.

Unless the custom scores is selected in the lesson settings the score section
in the question settings will be disabled. A help link has been added with
a description similar to this one.
MDL-45127 mod_lesson: Fixed reviewing lesson answers changing the lesson grade.
MDL-45127 mod_lesson: Behat test for reviewing a lesson.
Merge branch 'install_25_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_25_STABLE
weekly release 2.5.5+
Merge branch 'wip-MDL-45127-25' of git://github.com/abgreeve/moodle into MOODLE_25_STABLE
Merge branch 'MDL-45290-25' of git://github.com/jethac/moodle into MOODLE_25_STABLE
MDL-45383 test generator: Rebuild course cache after inserting module in db
Merge branch 'MDL-44174-25' of git://github.com/FMCorz/moodle into MOODLE_25_STABLE
Merge branch 'MDL-45342-25' of git://github.com/ankitagarwal/moodle into MOODLE_25_STABLE
Merge branch 'MDL-43319-25' of git://github.com/danpoltawski/moodle into MOODLE_25_STABLE
Merge branch 'MDL-34904-25' of git://github.com/ankitagarwal/moodle into MOODLE_25_STABLE
MDL-45412 cachestore_mongodb: fixed use of deprecated Mongo class
MDL-45290 rubric: IE8 and minor fixes, RTL

Added a fallback style for IE8, adjusted some minor styles, added RTL capability.