Pending Show Banned Word in Error Message

[iforgetwhyimhere :D]

When posting messages in chatrooms, an error (Attachment 1) will appear if the message contains a banned word. It can be hard to to tell what word specifically is banned, especially considering the variation between chatroom moderation. Proposed change (Attachment 2) shows a theoretical fix, simply showing the user what word(s) was/were banned within the message.