[FEAT] Pluralize some messages
[FEAT] Pluralize some messages

- unlink becomes the counter for removing links and redirect
- the number of changed links is the lenght of new_targets
- simplify targets string by join statement, use localized
  comma separator. targets will be an empty string if the
  new_targets list is empty.

Bug: T89678
Change-Id: Iff8f577e430deffea19b6763de1f53cfa58fd39e

jayvdb/pywikibot-core,magul/pywikibot-core,trishnaguha/pywikibot-core,hasteur/g13bot_tools_new,wikimedia/pywikibot-core,wikimedia/pywikibot-core,npdoty/pywikibot,VcamX/pywikibot-core,happy5214/pywikibot-core,h4ck3rm1k3/pywikibot-core,jayvdb/pywikibot-core,npdoty/pywikibot,emijrp/pywikibot-core,h4ck3rm1k3/pywikibot-core,valhallasw/pywikibot-core,TridevGuha/pywikibot-core,magul/pywikibot-core,hasteur/g13bot_tools_new,PersianWikipedia/pywikibot-core,smalyshev/pywikibot-core,xZise/pywikibot-core,hasteur/g13bot_tools_new,Darkdadaah/pywikibot-core,happy5214/pywikibot-core,darthbhyrava/pywikibot-local,Darkdadaah/pywikibot-core,icyflame/batman