Author: Eloy Lafuente (stronk7)
MDL-28048 glossary - fix double ampersand & missing string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=529950767485b16fb865b392182ff60561d5907f
http://github.com/moodle/moodle/commit/529950767485b16fb865b392182ff60561d5907f
+ 2.1 en [duplicatecategory,mod_glossary]