Use correct template tags for `{{ self.intro }}`
Use correct template tags for `{{ self.intro }}`

Fixes #1404
m-sanders/wagtail,quru/wagtail,iansprice/wagtail,mikedingjan/wagtail,nutztherookie/wagtail,hanpama/wagtail,iho/wagtail,kurtrwall/wagtail,zerolab/wagtail,serzans/wagtail,jordij/wagtail,mephizzle/wagtail,rv816/wagtail,kurtrwall/wagtail,KimGlazebrook/wagtail-experiment,hamsterbacke23/wagtail,kaedroho/wagtail,mikedingjan/wagtail,rsalmaso/wagtail,zerolab/wagtail,m-sanders/wagtail,serzans/wagtail,thenewguy/wagtail,iho/wagtail,davecranwell/wagtail,mjec/wagtail,kaedroho/wagtail,nimasmi/wagtail,WQuanfeng/wagtail,wagtail/wagtail,WQuanfeng/wagtail,rjsproxy/wagtail,bjesus/wagtail,iansprice/wagtail,bjesus/wagtail,hanpama/wagtail,iansprice/wagtail,hamsterbacke23/wagtail,tangentlabs/wagtail,mayapurmedia/wagtail,serzans/wagtail,mikedingjan/wagtail,thenewguy/wagtail,nutztherookie/wagtail,kurtw/wagtail,iho/wagtail,JoshBarr/wagtail,wagtail/wagtail,kaedroho/wagtail,Pennebaker/wagtail,jordij/wagtail,quru/wagtail,rsalmaso/wagtail,davecranwell/wagtail,jnns/wagtail,tangentlabs/wagtail,gasman/wagtail,darith27/wagtail,gasman/wagtail,hanpama/wagtail,mephizzle/wagtail,FlipperPA/wagtail,serzans/wagtail,kaedroho/wagtail,kurtw/wagtail,iansprice/wagtail,gogobook/wagtail,nilnvoid/wagtail,nimasmi/wagtail,wagtail/wagtail,janusnic/wagtail,jordij/wagtail,hamsterbacke23/wagtail,KimGlazebrook/wagtail-experiment,nrsimha/wagtail,FlipperPA/wagtail,FlipperPA/wagtail,mixxorz/wagtail,Toshakins/wagtail,takeshineshiro/wagtail,nimasmi/wagtail,gasman/wagtail,mixxorz/wagtail,takeshineshiro/wagtail,Pennebaker/wagtail,inonit/wagtail,davecranwell/wagtail,timorieber/wagtail,nilnvoid/wagtail,gasman/wagtail,janusnic/wagtail,darith27/wagtail,gogobook/wagtail,m-sanders/wagtail,torchbox/wagtail,zerolab/wagtail,takeflight/wagtail,timorieber/wagtail,mixxorz/wagtail,timorieber/wagtail,JoshBarr/wagtail,zerolab/wagtail,rsalmaso/wagtail,Klaudit/wagtail,thenewguy/wagtail,takeflight/wagtail,Klaudit/wagtail,nealtodd/wagtail,JoshBarr/wagtail,nrsimha/wagtail,janusnic/wagtail,nealtodd/wagtail,tangentlabs/wagtail,mjec/wagtail,FlipperPA/wagtail,gogobook/wagtail,jnns/wagtail,nilnvoid/wagtail,JoshBarr/wagtail,quru/wagtail,Tivix/wagtail,kurtrwall/wagtail,inonit/wagtail,bjesus/wagtail,mjec/wagtail,mayapurmedia/wagtail,hamsterbacke23/wagtail,mikedingjan/wagtail,wagtail/wagtail,Toshakins/wagtail,takeshineshiro/wagtail,mephizzle/wagtail,mjec/wagtail,nrsimha/wagtail,inonit/wagtail,mayapurmedia/wagtail,torchbox/wagtail,wagtail/wagtail,hanpama/wagtail,mephizzle/wagtail,Toshakins/wagtail,darith27/wagtail,jnns/wagtail,chrxr/wagtail,kurtw/wagtail,Klaudit/wagtail,nimasmi/wagtail,takeflight/wagtail,nutztherookie/wagtail,chrxr/wagtail,jnns/wagtail,timorieber/wagtail,rv816/wagtail,nealtodd/wagtail,thenewguy/wagtail,WQuanfeng/wagtail,Klaudit/wagtail,zerolab/wagtail,Tivix/wagtail,takeflight/wagtail,takeshineshiro/wagtail,janusnic/wagtail,darith27/wagtail,thenewguy/wagtail,Tivix/wagtail,Toshakins/wagtail,kurtw/wagtail,nutztherookie/wagtail,WQuanfeng/wagtail,mixxorz/wagtail,KimGlazebrook/wagtail-experiment,rjsproxy/wagtail,Tivix/wagtail,mayapurmedia/wagtail,chrxr/wagtail,m-sanders/wagtail,bjesus/wagtail,quru/wagtail,rjsproxy/wagtail,tangentlabs/wagtail,gogobook/wagtail,rsalmaso/wagtail,davecranwell/wagtail,rv816/wagtail,chrxr/wagtail,torchbox/wagtail,jordij/wagtail,iho/wagtail,kurtrwall/wagtail,inonit/wagtail,Pennebaker/wagtail,torchbox/wagtail,nrsimha/wagtail,nealtodd/wagtail,mixxorz/wagtail,kaedroho/wagtail,gasman/wagtail,rv816/wagtail,nilnvoid/wagtail,Pennebaker/wagtail,rjsproxy/wagtail,KimGlazebrook/wagtail-experiment,rsalmaso/wagtail