The G+ link under the article on the front page (not when you are on the articles site!) seems to always share http://www.domain.tld, not the article URL. I fixed this with by adding data-href on line 89 in content.php:
<div class=”g-plusone” data-href=”<?php the_permalink(); ?>” data-size=”medium”></div>
Furthermore the Facebook share-button is wider in German (“Like” vs. “Gefällt mir”). I changed “width:107″ on line 79 in content.php to “width:117″. But I don’t know how it looks like in English now.