Author: Sam Hemelryk
MDL-39575 install: better handling of database creation error.
Implemented better handling of DML exceptions.
Added translation for cannotcreatedb exception.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8c5ca6531bb28e1f9eda4db2a5af25afe93f9315
http://github.com/moodle/moodle/commit/8c5ca6531bb28e1f9eda4db2a5af25afe93f9315
+ 2.4 en [cannotcreatedboninstall,core_error]
+ 2.4 en [dmlexceptiononinstall,core_error]