- function str2url is compatible with utf-8
- removed some old code (useless)
- remove str_translate_to_ascii7bits and lang_table_translate_ascii7bits
- mail subject and address names can contain accentuated characters
git-svn-id: http://piwigo.org/svn/branches/branch-1_7@2125 68402e56-0260-453c-a942-63ccdbb3a9ee