Gtk-WARNING: Failed to set text from markup

Logs contain

(sugar-activity:1376): Gtk-WARNING **: 15:41:06.295: Failed to set text from
markup due to error parsing markup: Error on line 2: Entity did not end with a
semicolon; most likely you used an ampersand character without intending to
start an entity - escape ampersand as &amp;

No visible effect noted.

[ ] use debugging or GTK environment variables to isolate to cause (a line number, obviously not in sugar-activity),
[ ] fix the problem.

For anyone interested in working on it.

sugarlabs / browse-activity

Gtk-WARNING: Failed to set text from markup #90