[IMPROV] Consistent usage of 'force'
[IMPROV] Consistent usage of 'force'

The newly added function _cache_interwikimap is using 'refresh' instead of
'force' and is the only function with this nomenclature.

Change-Id: Ida651bfecc3fb51836376bd81e6e8fed384a1c71

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