posts only in one language

hello,

we translatet the posts from english to german.
but the blogpage shows only one language. it doesn’t switch to german.
when we translate the blog-page in german, it’s also empty.

we uses the theme http://themeforest.net/item/smartstart-wp-responsive-html5-theme/2067920

what would help there?

thank you for your help,
best regards,
pzimmer

https://wordpress.org/plugins/ceceppa-multilingua/