Notification of string changes

Author: Jun Pataleta
MDL-69008 core: Fix accessibility issues in paged content templates
* Added menuitem role for the "Show x per page" menu.
* Added appropriate aria-labels for the links in the paging bar.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=42cf09b5b4ff3afb4d38010849ab0e2dbc37abcf
http://github.com/moodle/moodle/commit/42cf09b5b4ff3afb4d38010849ab0e2dbc37abcf

+ 3.8 en [firstpage,core]
+ 3.8 en [lastpage,core]
+ 3.8 en [nextpage,core]
+ 3.8 en [previouspage,core]