Author: Helen Foster
MDL-68888 lang: Import fixed English strings (en_fix)
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4369ef030465fcfae72da72980a537dd8feb6c3a
http://github.com/moodle/moodle/commit/4369ef030465fcfae72da72980a537dd8feb6c3a
+ 3.8 en [defaulttimesplittingmethods_help,core_analytics]
+ 3.8 en [cachedef_grade_letters,core_cache]