I think that you need to be looking at menu.tpl in the /skin1/ directory, not the one in the /skin1/admin/ directory.
In the file that you just posted, that last line tells you what template that all the "capture" data is displayed in...
{ include file="menu.tpl" dingbats="dingbats_categorie.gif" menu_title=$lng.lbl_management menu_content=$smarty.capture.menu }
menu.tpl - and since there is no directory in front of it, that means that it is in the root of the skin1 directory.
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