Calendars translate

Can anyone tell me where I can translate these 2 calendars into dutch.

 
I have found 2 text files
/ plugins / calendar / calendar_lang
and
/ plugins / jquery / langs
I translate these files but nothing happens

Does anyone know where I can translate it?

Hey,

Did you tried to recompile language after translation?

Go to admin -> Settings -> Language settings, select language you need and click 'Compile'.