Author: David Monllao
MDL-42716 mod_assign: Lang str for the viewblinddetails capability
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e20392edc002ad70f5230f573d3ccc01f12bdfb5
http://github.com/moodle/moodle/commit/e20392edc002ad70f5230f573d3ccc01f12bdfb5
+ 2.8 en [assign:viewblinddetails,mod_assign]