Hi a found some interesting information to complete translate event_calendar to spanish, some transtations are availabe in language folder in es.php file, but what about calendar transtation like Months (Enero, Febrero..) Prev and next (siguiente, anterior)

I foun this information in:mod/event_calendar/ui.datepicker.packed.js

We have to change the last lines to the correspond texts.

atepicker|_changeDatepicker|instance|transparent|color|background|prepend|relative
|_disableDatepicker|_enableDatepicker|removeData|_destroyDatepicker|150|pageY|pageX|
_dialogDatepicker|_inlineShow|click|eval|getAttribute|setDefaults|console|hasDatepicker|
normal|first|as|Set|Sab|Vier|Jue|Mie|Mar|Lun|Do|Sab|Vier|Jue|Mie|Mar|Lun|Sun|

Saturday|Friday|

Thursay|Wednesday|Tuesday|Monday|Sunday|of|Week|Wk|Dec|Nov|Oct|Sep

|Aug|Jul|Jun|Apr|Mar|Feb|Ene|Deciembre|Noviembre|Octubre|Septiembre|Agosto

|Julio|Junio|Abril|Marzo|Febrero|Enero|Today|Next|Prev|without|Erase|Clear|dialog'.split('|'),0,{}))

I found this information usefull.

Eddy