fix(admin/add_column): stop modifying user input in stored data
An earlier change modifed the user's input when creating new columns in an existing Poll.
Indeed all ,
comma were replaced by -
dashes and the user inputs
was saved as such.
It seems the rational behind it was to keep the existing "formatting" of log messages where different elements were separated by commas.
This commit makes sure not to strip the users' data but only the logged message.
Fixes #384 (closed)