[IMPR] use format length
[IMPR] use format length

- Use format length instead expanding message strings by spaces

Change-Id: I56b0d48d80e4c5eceeea8beb688c0948b45dc85e

happy5214/pywikibot-core,wikimedia/pywikibot-core,Darkdadaah/pywikibot-core,Darkdadaah/pywikibot-core,hasteur/g13bot_tools_new,happy5214/pywikibot-core,magul/pywikibot-core,wikimedia/pywikibot-core,jayvdb/pywikibot-core,npdoty/pywikibot,PersianWikipedia/pywikibot-core,jayvdb/pywikibot-core,magul/pywikibot-core,hasteur/g13bot_tools_new,npdoty/pywikibot,hasteur/g13bot_tools_new