MDL-29708 Fixed extra slashes in $string['storedfilenotcreated'].
MDL-29708 Fixed file_exception() arguments in rename().
Merge branch 'm28_MDL-29708_Typo_Extra_Slashes' of https://github.com/scara/moodle
MDL-45763 question: fix SQL syntax for Oracle
MDL-39726 backup: fix SQL syntax for Oracle
MDL-39726 backup: fix SQL syntax for Oracle
MDL-45763 Question types: Allow saving '0' as question text.