I18N

- Renamed text.cpp/characters to utf8.cpp/utf8_length, which is more
  appropriate.

src/utf8.h

@@ -33,6 +33,8 @@ unsigned int utf8_codepoint (const std::string&);
 unsigned int utf8_next_char (const std::string&, std::string::size_type&);
 std::string utf8_character (unsigned int);
 int utf8_sequence (unsigned int);
+int utf8_length (const std::string&);
+
 
 #endif
 ////////////////////////////////////////////////////////////////////////////////