[fixes] Remove <nowiki /> tags arround ISBN numbers
[fixes] Remove <nowiki /> tags arround ISBN numbers

- add a generator for the <nowiki /> tags which could be overwriten by any
  generator option given to replace.py
- also simplify regex groups and fix multiple spaces between ISBN and number

Bug: T147180
Change-Id: Ie5942addaee800686cf87ea7c4e57ff68a37ab27

magul/pywikibot-core,wikimedia/pywikibot-core,wikimedia/pywikibot-core,magul/pywikibot-core,PersianWikipedia/pywikibot-core