I just added a new variable in admin/language/de_DE(in my case)/de_DE.php:
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$_['date_time'] = 'd.m.Y H:i';
Hope this helps out.
If this is hard for some people, you could just modify the admin/language/english/english.php:
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$_['date_format_short'] = 'd/m/Y';
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$_['date_format_short'] = 'd/m/Y H:i;