[FIX] i18n_tests: fixed a typo in a comment
[FIX] i18n_tests: fixed a typo in a comment

Change-Id: I60da5dddaaef848d519846883af1a231bdc681ad

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