Freshly installed store (with inmotionhosting.com, via cPanel), no any products created yet. PHP 5.3, MySQL Community Edition 5.0.96

Freshly added Spanish language seemed to be successful (only - for some reason, the Spanish flag icon does not show up though the 'icon.gif' is where it should be - in the folder includes/languages/spanish/images).
Tried also to add the German language - but without a success. I renamed the 'admin' folder to 'zcadmin' and copied the contents of de_DE folder to the shop folder (as instructed in adding Spanish language; the de_DE folder, downloaded from http://www.zen-cart.com/downloads.php?do=file&id=205, did not contain any instructions. Now, the (shop)/includes/languages contains the following:
Name: de_DE.png Views: 357 Size: 7.6 KB
The shop can be seen here: http://e-aiand.com/zen/

So far, I've made no any other changes to the install that adding these two languages.

So, how to install the German language? And what could be wrong with the Spanish flag icon? Later, I plan to add the Russian language as well - after the Spanish and German will be OK.