Here are some details: The theme is Twenty Eleven. The plugins are the same for all blogs (4 active), except for the Persian blog, which has the wp-jalali plugin installed (this is for persian date and calender stuff). I deactived it to see if that helps, but icons still don't show.
I performed some additional tests:
Zoom is set to 7, icon does not show. Zooming in a few times makes the icon show (some times), but not at the right position.
Here is a link to the post in question (I'll give you the short link, because the long one is a mess):
Here is the German version of the same post:
I performed another test with the Uyghur version of WordPress (also left to right) and a different theme, with the same result. There I only have two active plugins.
As for the translation. I have already thought about that. Do I need a login for that, or can I use the wordpress one?