Add system indicators back to data page

Since `formatted_value` got removed from the API indicators response, system-level indicators weren't displaying on the data page.  This adds back the (unformatted) data value for system indicators, instead of displaying "No Data Available."  Also puts into translation files some untranslated strings.
Since we still have formatted_value as a property on the indicator model, I think a better solution would be to figure out why the formatted value @property isn't being serialized in the API response.