Is it abuse

Is it abuse to submit language version of one site: for example:
www.mysite.com/index_de.php
www.mysite.com/index_eng.php
www.mysite.com/index_fr.php ect.

??

It is perfectly correct to submit multiple times for each distinct language if a site is in multiple languages. Submit to the correct category within each language within http://dmoz.org/World/

Submit if possible the main URL for the site - not the entry page for the language.

Do not submit machine translated pages.

For a detailed explanation see the ODP guidelines on multilingual sites. If you prefer, there is a german version available, too. And one in french ;-)

(We are not talking about machine-translated sites, of course.)