Space missing after user name in Timeline

[kwk]

@vikram-raj @sudsen I think there's a space missing after the user name when the description has changed.

I think this could be the place where this text is generated:

fabric8-planner/src/app/components_ngrx/work-item-event/work-item-event.component.html

Line 14 in 17598a9

edited the description