Handle tags that contain the tag delimiter

[fortress4]

When the delimiter used to separate tags is added to the entered tag, the tag renders with the delimiter in place (and the tag can be removed). However, the value added to the hidden field is treated as multiple tags.
The delimiter must not be allowed in the added tag.
Possible options:

1. Strip the delimiter character before adding the tag
2. Notify user when tag is added
3. Both