Notification of string changes

Author: Rossiani Wijaya
MDL-25186: add environmental check to recommend PHP 5.3.3


http://git.moodle.org/gw?p=moodle.git;a=commit;h=059518944a163f8c26ac944096364e70dbea4f64
http://github.com/moodle/moodle/commit/059518944a163f8c26ac944096364e70dbea4f64

+ 1.9 en [php533warning,core_admin]