fix(web): add colon to the end of mention only when mention is in beginning of the message
fix(web): add colon to the end of mention only when mention is in beginning of the message

dfsilva/actor-platform,dfsilva/actor-platform,EaglesoftZJ/actor-platform,dfsilva/actor-platform,EaglesoftZJ/actor-platform,actorapp/actor-platform,EaglesoftZJ/actor-platform,dfsilva/actor-platform,actorapp/actor-platform,ufosky-server/actor-platform,ufosky-server/actor-platform,actorapp/actor-platform,actorapp/actor-platform,ufosky-server/actor-platform,EaglesoftZJ/actor-platform,dfsilva/actor-platform,ufosky-server/actor-platform,actorapp/actor-platform,EaglesoftZJ/actor-platform,ufosky-server/actor-platform,actorapp/actor-platform,ufosky-server/actor-platform,dfsilva/actor-platform,EaglesoftZJ/actor-platform,ufosky-server/actor-platform,dfsilva/actor-platform,actorapp/actor-platform,EaglesoftZJ/actor-platform,dfsilva/actor-platform,EaglesoftZJ/actor-platform,actorapp/actor-platform,ufosky-server/actor-platform