Attached patch fixes three issues in Croatian translation of names of months and days of week.

1: Error
Long form of day of week names (day_names in hr.yml) are in incorrect order, and thus wrongly displayed on project calendar.
Sunday is translated as Monday, Monday as Tuesday, and so on...
Short form is OK.

2: Inconsistency
Diacritical marks are omitted from translation of long form of months (month_names in hr.yml) for January and February, while used everywhere else.

3: Inconsistency
Short form of month name (abbr_month_names) for October is four characters long, while others are shortened to three.
Although February seems too long as well, it should be left as it is; in Croatian lj is considered one letter written with two characters.
Yeah, sounds crazy, we have a lot of stuff like that. :o)

Proposed patch corrects the described issues, so I'm setting this to Resolved. Pardon me if I'm not supposed to. I'm new here.