Date formats are incorrect in some locales in the time plugin
Problem 1 The problem is that some of the dates shows are wrong in Catalan for example "dg. de maig 12" or "diumenge de maig'
This is defined here: https://gitlab.gnome.org/GNOME/gedit/blob/master/plugins/time/gedit-time-plugin.c#L44
This problem was introduced when glib 2.27 changed the %b formatter
Problem 2 The list of date and time formatters is pretty extensive and some of them do not make any sense in your locale.
- Show the typical US formats used in programming (e.g. ChangeLog date format, etc)
- Show the typical data / format used on your local for Date and Time
- Allow to localized all of them using the PO file