On admin panel - Reporting - is not possible tralsate this:

A Built-in Reporting System provides every user with the ability to report any bad or unwanted content on the site. Currently, users can report objects such as photos, video, events, groups, discussions, etc.. Reporting small User-Posted content, e.g. Activity Stream Comments, is not yet possible.

Hi Onimaro,

you can make override for this:
copy /administrator/components/com_community/views/reports/tmpl/default.php to /administrator/templates/your-admin-template/html/com_community/reports/default.php

edit that new file at line 28, if you want make multi languange
change that:
from

<p>A Built-in Reporting System provides every user with the ability to report any bad or unwanted content on the site. Currently, users can report objects such as photos, video, events, groups, discussions, etc.. Reporting small User-Posted content, e.g. Activity Stream Comments, is not yet possible.</p>

<p><?php echo JText::_('COM_COMMUNITY_REPORT_DESC'); ?></p>

Since I deal with the translation into Italian of JomSocial I wait for a fix.

Hi Onimaro,

my override solution is the best way, because when your upgrade your jomsocial next time. the changes will not lost.
if you don't know how to do it. please provide me FTP access detail. I will do it for you.

Regards,
Albert