Generalize .flow-creator

* Removed similar code from multiple places and combined into various.css
* Changed topic reply form's .flow-creator: it was not getting the links & hover
  like on other posts (inconsistent), which I assume was caused by changing the
  code of these links (used to be some JS code for showing/hiding the links,
  IIRC) and forgetting this occurrence

Change-Id: I559a94972e88aeeb290c3be3696f8348f7a345b7
Merge "Generalize .flow-creator"