[Plugin: All-in-One Event Calendar] Theme development – translations half-broken

Hi,

I stared developing a custom calendar theme based on the default Vortex theme. What I noticed is that now some translations don’t work anymore (German). Some stuff works (e.g. the translation for “tags”, “categories”), other stuff not (e.g. “month” or “all day” are not translated.
I checked the languages files (which I didn’t alter), but there the translations are fine. Is there anything to consider in the theme (calling for the language file etc.)?

Thanks!

http://wordpress.org/extend/plugins/all-in-one-event-calendar/