Remove trailing whitespace
Allow more flexible translations for “empty” values

The “empty” value actually means any value, ie. any hour, any minute,
any month or any day of week, day of month, etc. Translations of “any”
for each of these types differ in many languages.

By specifying a language translation for `empty_day_of_month`, one can
now customize these translations. If no custom per-type translation is
available, the default one for `empty` will be used.
Update the minified version of the script
Merge pull request #9 from mitio/more-flexible-translations

More flexible translations for "empty" values