For now asterCRM provides user two languages, English and Simplified Chinese, if you want to add a new language, follow this article you can make it yourself.
say you want to add German to astercrm, first go to astercrm/login.php and find the following lines:
<OPTION value=”en_US”>English</OPTION>
<OPTION value=”cn_ZH”>简体中文</OPTION>
we use de_GER for German so we add line then it [...]