Prompts and Messages
From PhpCOIN Documentation
Almost every prompt or message that phpCOIN displays to users is contained within language files. The directory /coin_lang/lang_xxx contains all the files for a particular language, where xxx is the language name, such as lang_english, lang_french, etc..
To change any of the prompts or messages that phpCOIN displays or uses, open the appropriate language file and make your desired changes. lang_config.php contains mostly configuration arrays, lang_base.php contains mostly system-wide text, and lang_yyyyy.php contains the strings for the yyyyy module.
When you upgrade phpCOIN your changes will be overwritten by the new phpCOIN files, unless you setup over-ride files.