xF2 Add-on Calendar 5.5

Added 'Calendar recurring weekly' and 'Calendar recurring yearly' buttons to menu.​

Fixed issue dealing with obtaining the visitors user_id.​

Added calendar menu.​

Fixed typo in the calendar_event_end_date_error phrase.​

Fixed issue with Console error message. Updated template JS code.​

Updated template code to be more compatible with third party styles.​

1) Fixed language phrasing for weekday responsive.
2) Fixed border color issue.
3) Fixed weekday color issue.

Now fully responsive.​

Fixed issue with Calendar remove single.​

Deleted orphaned phrase.​