Comment 6 for bug 320388

see
       http://invisible-island.net/xterm/xterm.log.html#xterm_210

man xterm (resource settings):

       utf8Title (class Utf8Title)
               Applications can set xterm's title by writing a control
               sequence. Normally this control sequence follows the VT220
               convention, which encodes the string in ISO-8859-1 and allows
               for an 8-bit string terminator. If xterm is started in a UTF-8
               locale, it translates the ISO-8859-1 string to UTF-8 to work
               with the X libraries which assume the string is UTF-8.

               However, some users may wish to write a title string encoded in
               UTF-8. Set this resource to "true" to allow UTF-8 encoded
               title strings. That cancels the translation to UTF-8, allowing
               UTF-8 strings to be displayed as is.

               The default is "false."