[Bug] Date parser doesn't recognise "8th Jan" when used with the "every" prefix
1) Create a new task with name 'foo' and due date 'every 8th jan'
2) Click add task
New task added that is set to reoccur once a year on 8th Jan.
* "Invalid date" error shown.
* You have to instead use "every 8 jan" (ie without the "th")
* However using "8th jan" on its own (not reoccurring) works - guessing the regexp for the "every" prefix is just not handling the "th" case.