Author: Tim Hunt
MDL-41248 completion: fix non-translatable text.
There were two hard-coded strings. Thanks to Guido Hornig for the suggested fix.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8d3debf360c04e775092894c8b20794d44d8f54a
http://github.com/moodle/moodle/commit/8d3debf360c04e775092894c8b20794d44d8f54a
+ 2.7 en [daysoftotal,core_completion]