[Py2Py3] Migrate module Unified/htmlor.py (fast)

**Impact of the new feature**
Assistance page creation

**Is your feature request related to a problem? Please describe.**
End of Py2 support

**Describe the solution you'd like**
All necessary features should be kept and unnecessary ones should be removed.

**Describe alternatives you've considered**
None

**Additional context**
@z4027163  FYI
