When localizing Vivvo to your language here is what you should know:

1. Vivvo front end language file is located in lang/ folder
2. Vivvo admin language file is located in lang/admin/ folder
3. Plugin lang files are located in plugin_root/lang/ and plugin_root/admin/lang/
4. Do not edit english.php. Copy it to your_lang.php, you can later choose your language file trough preferences
5. VIVVO_DB_COLLATION determents the MySQL collation for text sorting (note only the UTF-8 collations can be used). This applies only to MySQL 4.1+ servers)
   
   see more here:
   http://dev.mysql.com/doc/refman/5.0/en/charset.html
   http://dev.mysql.com/doc/refman/5.0/en/charset-unicode-sets.html
   
   
6. VIVVO_LANG_CODE - value that denotes language on your web site (ie en-US)
   
   see more here:
   http://tlt.its.psu.edu/suggestions/international/web/tips/langtag.html
   http://ftp.ics.uci.edu/pub/ietf/http/related/iso639.txt
   
   
7. Use editor that is able to save text without UTF-8 BOM (Notepad++, ...)
   
   see more here:
   http://notepad-plus.sourceforge.net/uk/site.htm
   http://www.w3.org/International/questions/qa-utf8-bom