Author: Dongsheng Cai
MDL-10783, added span class and tag title
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cc26cb3b3372467650187a226f3cdc03aaaade12
http://github.com/moodle/moodle/commit/cc26cb3b3372467650187a226f3cdc03aaaade12
+ 2.0 en [tagtitle,mod_wiki]