Perf: Fix caching based on ISignals
Perf: Fix caching based on ISignals

GetLocalizedString result was never cached because of a bug in
ISignals implementation: the token was always "IsCurrent == false",
which meants the cache was always out-of-date.

--HG--
branch : dev

SouleDesigns/SouleDesigns.Orchard,tobydodds/folklife,OrchardCMS/Orchard-Harvest-Website,marcoaoteixeira/Orchard,geertdoornbos/Orchard,Morgma/valleyviewknolls,huoxudong125/Orchard,fassetar/Orchard,JRKelso/Orchard,brownjordaninternational/OrchardCMS,RoyalVeterinaryCollege/Orchard,caoxk/orchard,SzymonSel/Orchard,rtpHarry/Orchard,smartnet-developers/Orchard,oxwanawxo/Orchard,spraiin/Orchard,abhishekluv/Orchard,escofieldnaxos/Orchard,escofieldnaxos/Orchard,neTp9c/Orchard,jerryshi2007/Orchard,smartnet-developers/Orchard,OrchardCMS/Orchard-Harvest-Website,Praggie/Orchard,arminkarimi/Orchard,hbulzy/Orchard,vairam-svs/Orchard,dcinzona/Orchard,harmony7/Orchard,jersiovic/Orchard,sfmskywalker/Orchard,KeithRaven/Orchard,jimasp/Orchard,alejandroaldana/Orchard,NIKASoftwareDevs/Orchard,princeppy/JPYSites-Orchard-Azure-Live-SourceCode,yersans/Orchard,fassetar/Orchard,luchaoshuai/Orchard,sfmskywalker/Orchard,MpDzik/Orchard,Inner89/Orchard,cooclsee/Orchard,dcinzona/Orchard-Harvest-Website,fortunearterial/Orchard,dburriss/Orchard,sfmskywalker/Orchard-Off-The-Grid-Sample-Code,cooclsee/Orchard,Codinlab/Orchard,tobydodds/folklife,tobydodds/folklife,sebastienros/msc,andyshao/Orchard,geertdoornbos/Orchard,Morgma/valleyviewknolls,sfmskywalker/Orchard-Off-The-Grid-Sample-Code,hannan-azam/Orchard,Cphusion/Orchard,MpDzik/Orchard,qt1/Orchard,planetClaire/Orchard-LETS,Anton-Am/Orchard,MpDzik/Orchard,IDeliverable/Orchard,stormleoxia/Orchard,luchaoshuai/Orchard,sfmskywalker/Orchard,Fogolan/OrchardForWork,planetClaire/Orchard-LETS,Ermesx/Orchard,patricmutwiri/Orchard,mgrowan/Orchard,fassetar/Orchard,fortunearterial/Orchard,sfmskywalker/Orchard-Off-The-Grid-Sample-Code,aaronamm/Orchard,hannan-azam/Orchard,gcsuk/Orchard,LaserSrl/Orchard,infofromca/Orchard,qt1/orchard4ibn,jchenga/Orchard,hbulzy/Orchard,salarvand/Portal,omidnasri/Orchard,arminkarimi/Orchard,abhishekluv/Orchard,TaiAivaras/Orchard,patricmutwiri/Orchard,cooclsee/Orchard,mvarblow/Orchard,ehe888/Orchard,johnnyqian/Orchard,SeyDutch/Airbrush,asabbott/chicagodevnet-website,Fogolan/OrchardForWork,mgrowan/Orchard,Praggie/Orchard,sfmskywalker/Orchard,austinsc/Orchard,asabbott/chicagodevnet-website,cryogen/orchard,abhishekluv/Orchard,RoyalVeterinaryCollege/Orchard,qt1/Orchard,caoxk/orchard,dcinzona/Orchard,spraiin/Orchard,cryogen/orchard,IDeliverable/Orchard,salarvand/orchard,Lombiq/Orchard,tobydodds/folklife,andyshao/Orchard,AndreVolksdorf/Orchard,armanforghani/Orchard,SeyDutch/Airbrush,qt1/orchard4ibn,Inner89/Orchard,AEdmunds/beautiful-springtime,tobydodds/folklife,RoyalVeterinaryCollege/Orchard,yonglehou/Orchard,caoxk/orchard,AndreVolksdorf/Orchard,fassetar/Orchard,OrchardCMS/Orchard,harmony7/Orchard,SzymonSel/Orchard,angelapper/Orchard,Serlead/Orchard,phillipsj/Orchard,LaserSrl/Orchard,dmitry-urenev/extended-orchard-cms-v10.1,johnnyqian/Orchard,AEdmunds/beautiful-springtime,kgacova/Orchard,phillipsj/Orchard,jimasp/Orchard,kouweizhong/Orchard,qt1/orchard4ibn,IDeliverable/Orchard,bedegaming-aleksej/Orchard,Dolphinsimon/Orchard,cryogen/orchard,xiaobudian/Orchard,salarvand/Portal,yonglehou/Orchard,grapto/Orchard.CloudBust,m2cms/Orchard,yonglehou/Orchard,qt1/orchard4ibn,smartnet-developers/Orchard,Dolphinsimon/Orchard,angelapper/Orchard,Ermesx/Orchard,hhland/Orchard,dburriss/Orchard,salarvand/orchard,TalaveraTechnologySolutions/Orchard,infofromca/Orchard,yersans/Orchard,OrchardCMS/Orchard-Harvest-Website,NIKASoftwareDevs/Orchard,Codinlab/Orchard,marcoaoteixeira/Orchard,m2cms/Orchard,omidnasri/Orchard,JRKelso/Orchard,jimasp/Orchard,openbizgit/Orchard,Anton-Am/Orchard,armanforghani/Orchard,jagraz/Orchard,Inner89/Orchard,salarvand/orchard,openbizgit/Orchard,armanforghani/Orchard,spraiin/Orchard,Morgma/valleyviewknolls,rtpHarry/Orchard,dcinzona/Orchard-Harvest-Website,xiaobudian/Orchard,escofieldnaxos/Orchard,gcsuk/Orchard,vairam-svs/Orchard,Morgma/valleyviewknolls,LaserSrl/Orchard,vairam-svs/Orchard,jtkech/Orchard,vard0/orchard.tan,m2cms/Orchard,ericschultz/outercurve-orchard,MpDzik/Orchard,Sylapse/Orchard.HttpAuthSample,jaraco/orchard,qt1/Orchard,ehe888/Orchard,tobydodds/folklife,Serlead/Orchard,aaronamm/Orchard,enspiral-dev-academy/Orchard,geertdoornbos/Orchard,jtkech/Orchard,jerryshi2007/Orchard,MetSystem/Orchard,rtpHarry/Orchard,escofieldnaxos/Orchard,OrchardCMS/Orchard,emretiryaki/Orchard,Cphusion/Orchard,huoxudong125/Orchard,openbizgit/Orchard,bigfont/orchard-continuous-integration-demo,AdvantageCS/Orchard,kgacova/Orchard,emretiryaki/Orchard,jagraz/Orchard,OrchardCMS/Orchard,AEdmunds/beautiful-springtime,qt1/Orchard,DonnotRain/Orchard,alejandroaldana/Orchard,dcinzona/Orchard,qt1/orchard4ibn,dcinzona/Orchard,dcinzona/Orchard-Harvest-Website,hbulzy/Orchard,TalaveraTechnologySolutions/Orchard,ericschultz/outercurve-orchard,johnnyqian/Orchard,dozoft/Orchard,oxwanawxo/Orchard,jagraz/Orchard,phillipsj/Orchard,Ermesx/Orchard,Lombiq/Orchard,bigfont/orchard-continuous-integration-demo,SouleDesigns/SouleDesigns.Orchard,hannan-azam/Orchard,dozoft/Orchard,NIKASoftwareDevs/Orchard,dozoft/Orchard,neTp9c/Orchard,KeithRaven/Orchard,austinsc/Orchard,TaiAivaras/Orchard,salarvand/Portal,SzymonSel/Orchard,kouweizhong/Orchard,qt1/orchard4ibn,alejandroaldana/Orchard,sebastienros/msc,jerryshi2007/Orchard,planetClaire/Orchard-LETS,Serlead/Orchard,KeithRaven/Orchard,armanforghani/Orchard,jchenga/Orchard,Lombiq/Orchard,sfmskywalker/Orchard,kgacova/Orchard,TaiAivaras/Orchard,li0803/Orchard,mgrowan/Orchard,spraiin/Orchard,Cphusion/Orchard,bigfont/orchard-cms-modules-and-themes,KeithRaven/Orchard,NIKASoftwareDevs/Orchard,JRKelso/Orchard,Codinlab/Orchard,spraiin/Orchard,MpDzik/Orchard,li0803/Orchard,jagraz/Orchard,jerryshi2007/Orchard,jersiovic/Orchard,aaronamm/Orchard,alejandroaldana/Orchard,dmitry-urenev/extended-orchard-cms-v10.1,omidnasri/Orchard,Codinlab/Orchard,OrchardCMS/Orchard,Sylapse/Orchard.HttpAuthSample,luchaoshuai/Orchard,ericschultz/outercurve-orchard,johnnyqian/Orchard,RoyalVeterinaryCollege/Orchard,harmony7/Orchard,marcoaoteixeira/Orchard,yonglehou/Orchard,gcsuk/Orchard,RoyalVeterinaryCollege/Orchard,yersans/Orchard,AndreVolksdorf/Orchard,kgacova/Orchard,MpDzik/Orchard,omidnasri/Orchard,bigfont/orchard-cms-modules-and-themes,dmitry-urenev/extended-orchard-cms-v10.1,asabbott/chicagodevnet-website,AdvantageCS/Orchard,cooclsee/Orchard,qt1/Orchard,arminkarimi/Orchard,abhishekluv/Orchard,andyshao/Orchard,xkproject/Orchard,JRKelso/Orchard,xkproject/Orchard,huoxudong125/Orchard,jtkech/Orchard,AndreVolksdorf/Orchard,SouleDesigns/SouleDesigns.Orchard,oxwanawxo/Orchard,bigfont/orchard-cms-modules-and-themes,smartnet-developers/Orchard,harmony7/Orchard,LaserSrl/Orchard,sebastienros/msc,jimasp/Orchard,grapto/Orchard.CloudBust,neTp9c/Orchard,bigfont/orchard-cms-modules-and-themes,mvarblow/Orchard,sfmskywalker/Orchard-Off-The-Grid-Sample-Code,hhland/Orchard,enspiral-dev-academy/Orchard,bedegaming-aleksej/Orchard,Anton-Am/Orchard,Dolphinsimon/Orchard,OrchardCMS/Orchard,Sylapse/Orchard.HttpAuthSample,vairam-svs/Orchard,neTp9c/Orchard,ehe888/Orchard,planetClaire/Orchard-LETS,sfmskywalker/Orchard-Off-The-Grid-Sample-Code,kgacova/Orchard,jerryshi2007/Orchard,princeppy/JPYSites-Orchard-Azure-Live-SourceCode,bigfont/orchard-continuous-integration-demo,kouweizhong/Orchard,abhishekluv/Orchard,patricmutwiri/Orchard,JRKelso/Orchard,emretiryaki/Orchard,aaronamm/Orchard,omidnasri/Orchard,phillipsj/Orchard,ehe888/Orchard,angelapper/Orchard,AndreVolksdorf/Orchard,dburriss/Orchard,vard0/orchard.tan,brownjordaninternational/OrchardCMS,dcinzona/Orchard-Harvest-Website,omidnasri/Orchard,jersiovic/Orchard,li0803/Orchard,bedegaming-aleksej/Orchard,Ermesx/Orchard,SouleDesigns/SouleDesigns.Orchard,arminkarimi/Orchard,enspiral-dev-academy/Orchard,jchenga/Orchard,dburriss/Orchard,sfmskywalker/Orchard,vard0/orchard.tan,Inner89/Orchard,OrchardCMS/Orchard-Harvest-Website,xiaobudian/Orchard,DonnotRain/Orchard,salarvand/orchard,fortunearterial/Orchard,openbizgit/Orchard,SouleDesigns/SouleDesigns.Orchard,hbulzy/Orchard,kouweizhong/Orchard,dozoft/Orchard,mvarblow/Orchard,cooclsee/Orchard,SeyDutch/Airbrush,dozoft/Orchard,Lombiq/Orchard,OrchardCMS/Orchard-Harvest-Website,huoxudong125/Orchard,fassetar/Orchard,mgrowan/Orchard,Fogolan/OrchardForWork,Praggie/Orchard,marcoaoteixeira/Orchard,jchenga/Orchard,geertdoornbos/Orchard,openbizgit/Orchard,brownjordaninternational/OrchardCMS,Anton-Am/Orchard,yersans/Orchard,DonnotRain/Orchard,Sylapse/Orchard.HttpAuthSample,andyshao/Orchard,escofieldnaxos/Orchard,Fogolan/OrchardForWork,dcinzona/Orchard-Harvest-Website,sfmskywalker/Orchard,jersiovic/Orchard,Morgma/valleyviewknolls,DonnotRain/Orchard,dmitry-urenev/extended-orchard-cms-v10.1,jaraco/orchard,yersans/Orchard,gcsuk/Orchard,MetSystem/Orchard,SzymonSel/Orchard,Inner89/Orchard,bigfont/orchard-continuous-integration-demo,IDeliverable/Orchard,AdvantageCS/Orchard,OrchardCMS/Orchard-Harvest-Website,sfmskywalker/Orchard,Serlead/Orchard,bedegaming-aleksej/Orchard,princeppy/JPYSites-Orchard-Azure-Live-SourceCode,grapto/Orchard.CloudBust,planetClaire/Orchard-LETS,hhland/Orchard,MetSystem/Orchard,xiaobudian/Orchard,salarvand/Portal,li0803/Orchard,xkproject/Orchard,gcsuk/Orchard,TalaveraTechnologySolutions/Orchard,xiaobudian/Orchard,AdvantageCS/Orchard,KeithRaven/Orchard,TalaveraTechnologySolutions/Orchard,vard0/orchard.tan,stormleoxia/Orchard,stormleoxia/Orchard,stormleoxia/Orchard,jtkech/Orchard,caoxk/orchard,vairam-svs/Orchard,marcoaoteixeira/Orchard,dmitry-urenev/extended-orchard-cms-v10.1,arminkarimi/Orchard,patricmutwiri/Orchard,austinsc/Orchard,Lombiq/Orchard,smartnet-developers/Orchard,xkproject/Orchard,vard0/orchard.tan,TalaveraTechnologySolutions/Orchard,hannan-azam/Orchard,stormleoxia/Orchard,AEdmunds/beautiful-springtime,emretiryaki/Orchard,hannan-azam/Orchard,NIKASoftwareDevs/Orchard,princeppy/JPYSites-Orchard-Azure-Live-SourceCode,angelapper/Orchard,omidnasri/Orchard,grapto/Orchard.CloudBust,oxwanawxo/Orchard,mvarblow/Orchard,salarvand/orchard,TaiAivaras/Orchard,asabbott/chicagodevnet-website,hhland/Orchard,jchenga/Orchard,fortunearterial/Orchard,Fogolan/OrchardForWork,grapto/Orchard.CloudBust,angelapper/Orchard,Dolphinsimon/Orchard,andyshao/Orchard,infofromca/Orchard,xkproject/Orchard,brownjordaninternational/OrchardCMS,cryogen/orchard,m2cms/Orchard,abhishekluv/Orchard,Anton-Am/Orchard,luchaoshuai/Orchard,infofromca/Orchard,neTp9c/Orchard,ehe888/Orchard,rtpHarry/Orchard,infofromca/Orchard,Ermesx/Orchard,rtpHarry/Orchard,johnnyqian/Orchard,oxwanawxo/Orchard,MetSystem/Orchard,li0803/Orchard,austinsc/Orchard,patricmutwiri/Orchard,ericschultz/outercurve-orchard,AdvantageCS/Orchard,luchaoshuai/Orchard,TalaveraTechnologySolutions/Orchard,dcinzona/Orchard-Harvest-Website,jtkech/Orchard,mvarblow/Orchard,aaronamm/Orchard,geertdoornbos/Orchard,mgrowan/Orchard,Dolphinsimon/Orchard,Sylapse/Orchard.HttpAuthSample,brownjordaninternational/OrchardCMS,Praggie/Orchard,emretiryaki/Orchard,kouweizhong/Orchard,bedegaming-aleksej/Orchard,sebastienros/msc,dburriss/Orchard,sebastienros/msc,Cphusion/Orchard,SzymonSel/Orchard,grapto/Orchard.CloudBust,vard0/orchard.tan,hhland/Orchard,salarvand/Portal,SeyDutch/Airbrush,jagraz/Orchard,yonglehou/Orchard,m2cms/Orchard,SeyDutch/Airbrush,jaraco/orchard,alejandroaldana/Orchard,bigfont/orchard-cms-modules-and-themes,jimasp/Orchard,DonnotRain/Orchard,Serlead/Orchard,Praggie/Orchard,IDeliverable/Orchard,austinsc/Orchard,harmony7/Orchard,phillipsj/Orchard,armanforghani/Orchard,omidnasri/Orchard,fortunearterial/Orchard,LaserSrl/Orchard,hbulzy/Orchard,huoxudong125/Orchard,jaraco/orchard,jersiovic/Orchard,enspiral-dev-academy/Orchard,dcinzona/Orchard,omidnasri/Orchard,MetSystem/Orchard,TalaveraTechnologySolutions/Orchard,TaiAivaras/Orchard,TalaveraTechnologySolutions/Orchard,enspiral-dev-academy/Orchard,Cphusion/Orchard,princeppy/JPYSites-Orchard-Azure-Live-SourceCode,Codinlab/Orchard