Hi Rachel – I think for multi-languages, you probably will need a plugin rather than a theme. I took a look at some and saw one that looks promising – “qTranslate” http://wordpress.org/extend/plugins/qtranslate/
The Commons does not have this plugin installed, but you could request it. Our developers will need to vet it, and if it looks ok, we can install and you could activate it and use – it looks like it creates a switch in your sidebar that you click to switch languages.
The Commons has the Google Calendar plugin installed, and you can activate it and place as a widget in your sidebar. Let me know if you need help.
In terms of themes – there is a really simple, clean theme called Blueprint that you might want to check out for text. But there are lots around – maybe just shop around. I like the Canvas theme by Woo for its customizability but not sure exactly what you are looking for.
Maybe others have suggestions.
Hope this helps.