Author: Rossiani Wijaya
MDL-36905 accessibility for assignment grading: add label for grading actions and operations select options
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e8dd79957016131680984ef512d768cf34c85946
http://github.com/moodle/moodle/commit/e8dd79957016131680984ef512d768cf34c85946
+ 2.3 en [choosegradingaction,mod_assign]
+ 2.3 en [chooseoperation,mod_assign]