Add support for localized date and time formats

calendar_translations now supports localization of the following new format strings, which were added in calendar v0.12.2:

• %x - localized date
• %X - localized time
• %c - localized date + time

Allow newer versions of calendar

• Loosened the version requirement to ~> 0.11
• Improved the documentation

First Release

This is the first release.