Fix markup parsing issue in message bubbles
(sm.puri.Chatty:47788): Gtk-WARNING **: 16:22:10.628: Failed to set text 'Lorem [ipsum@dolor.sit/amet] entered the room.' from markup due to error parsing markup: Unknown tag 'I' on line 1 char 27
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(sm.puri.Chatty:47788): Gtk-WARNING **: 16:22:10.628: Failed to set text 'Lorem [ipsum@dolor.sit/amet] entered the room.' from markup due to error parsing markup: Unknown tag 'I' on line 1 char 27