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).
MDL-45383 test generator: Rebuild course cache after inserting module in db
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.
Merge branch 'MDL-45376-m25' of https://github.com/sammarshallou/moodle into MOODLE_25_STABLE
Merge branch 'MDL-45290-25-fix2' of http://github.com/jethac/moodle into MOODLE_25_STABLE
Merge branch '45412-25' of git://github.com/samhemelryk/moodle into MOODLE_25_STABLE
MDL-45412 Cache: Look for the newer classname first (mongo store)
Merge branch 'wip-mdl-45383' of git://github.com/rajeshtaneja/moodle into MOODLE_25_STABLE