Patch various i18n holes

Details:

- Make translatable some captions in list.html
- Make translatable caption in order_list.html
- Make translatable fieldname in apps/offer/models
- Make translatable caption in range_list.html
- Make translatable values in column 'is_active'
- Make translatable caption in voucher_list.html
- Make clickable link in discount description
- Make translatable caption in voucher_detail.html
- Display full description for field 'Usage'
- Make translatable field 'Promotion type'
- Make translatable caption in review_list.html
- Set output format for value due local settings.  Russians use a comma
  (not a dot) to distinguish between the whole and the remainder.

Fixes #650