Updated blocktrans strings for i18n

One case in particular:
Due <span> [date] (in [time]) </span>
Was not going to be possible to remove from the translator's view.  In place of that removal we added a helpful comment to translators.
Add a translators comment here explaining what "Training" means and how it is used (multiple ways to think about translating this, if you don't nkow how ORA works)