Notification of string changes

Author: Sam Hemelryk
MDL-43033 cache: added a warning icon for mappings
We now show a warning icon with an explanatory alt if the user
has mapped a store as a mode default that doesn't not fulfill the
requirements of every known definition.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=d7b0846147f2b14485403cf32d644725c99e7f89
http://github.com/moodle/moodle/commit/d7b0846147f2b14485403cf32d644725c99e7f89

+ 2.4 en [inadequatestoreformapping,core_cache]