Renderer#_render_template should be private
Renderer#_render_template should be private

Closes #12831

yalab/rails,georgeclaghorn/rails,illacceptanything/illacceptanything,joonyou/rails,koic/rails,maicher/rails,kmayer/rails,xlymian/rails,tgxworld/rails,Envek/rails,eileencodes/rails,sealocal/rails,matrinox/rails,yahonda/rails,kaspth/rails,brchristian/rails,georgeclaghorn/rails,gcourtemanche/rails,deraru/rails,palkan/rails,mijoharas/rails,sealocal/rails,georgeclaghorn/rails,yhirano55/rails,aditya-kapoor/rails,stefanmb/rails,Edouard-chin/rails,shioyama/rails,BlakeWilliams/rails,jeremy/rails,schuetzm/rails,Stellenticket/rails,betesh/rails,Vasfed/rails,Erol/rails,yasslab/railsguides.jp,alecspopa/rails,Stellenticket/rails,eileencodes/rails,odedniv/rails,shioyama/rails,untidy-hair/rails,rossta/rails,esparta/rails,vassilevsky/rails,mtsmfm/rails,yawboakye/rails,yahonda/rails,sergey-alekseev/rails,rafaelfranca/omg-rails,bradleypriest/rails,rbhitchcock/rails,MSP-Greg/rails,printercu/rails,brchristian/rails,bolek/rails,bolek/rails,stefanmb/rails,mtsmfm/rails,tijwelch/rails,kirs/rails-1,samphilipd/rails,ngpestelos/rails,betesh/rails,bolek/rails,EmmaB/rails-1,Envek/rails,samphilipd/rails,arunagw/rails,hanystudy/rails,yasslab/railsguides.jp,yhirano55/rails,BlakeWilliams/rails,Sen-Zhang/rails,vipulnsward/rails,alecspopa/rails,Spin42/rails,gauravtiwari/rails,rails/rails,marklocklear/rails,vipulnsward/rails,iainbeeston/rails,repinel/rails,bradleypriest/rails,starknx/rails,notapatch/rails,travisofthenorth/rails,assain/rails,kachick/rails,illacceptanything/illacceptanything,joonyou/rails,yasslab/railsguides.jp,gcourtemanche/rails,notapatch/rails,tgxworld/rails,yahonda/rails,fabianoleittes/rails,sergey-alekseev/rails,arjes/rails,rbhitchcock/rails,riseshia/railsguides.kr,flanger001/rails,schuetzm/rails,rossta/rails,esparta/rails,baerjam/rails,kachick/rails,aditya-kapoor/rails,EmmaB/rails-1,tgxworld/rails,tijwelch/rails,gcourtemanche/rails,ngpestelos/rails,repinel/rails,vassilevsky/rails,palkan/rails,fabianoleittes/rails,mathieujobin/reduced-rails-for-travis,rbhitchcock/rails,samphilipd/rails,yawboakye/rails,notapatch/rails,mohitnatoo/rails,Envek/rails,MSP-Greg/rails,marklocklear/rails,riseshia/railsguides.kr,gfvcastro/rails,mijoharas/rails,mohitnatoo/rails,maicher/rails,voray/rails,prathamesh-sonpatki/rails,BlakeWilliams/rails,kddeisz/rails,ttanimichi/rails,repinel/rails,MichaelSp/rails,starknx/rails,prathamesh-sonpatki/rails,eileencodes/rails,kmcphillips/rails,pvalena/rails,88rabbit/newRails,richseviora/rails,lucasmazza/rails,illacceptanything/illacceptanything,arunagw/rails,illacceptanything/illacceptanything,jeremy/rails,schuetzm/rails,Stellenticket/rails,deraru/rails,prathamesh-sonpatki/rails,Envek/rails,illacceptanything/illacceptanything,fabianoleittes/rails,yawboakye/rails,bogdanvlviv/rails,tijwelch/rails,shioyama/rails,lcreid/rails,illacceptanything/illacceptanything,ttanimichi/rails,ledestin/rails,rafaelfranca/omg-rails,Stellenticket/rails,illacceptanything/illacceptanything,richseviora/rails,arunagw/rails,kmayer/rails,prathamesh-sonpatki/rails,kmcphillips/rails,MichaelSp/rails,yahonda/rails,aditya-kapoor/rails,MichaelSp/rails,Erol/rails,aditya-kapoor/rails,arunagw/rails,felipecvo/rails,Erol/rails,iainbeeston/rails,rails/rails,tjschuck/rails,esparta/rails,mechanicles/rails,pschambacher/rails,yawboakye/rails,kenta-s/rails,schuetzm/rails,tjschuck/rails,MSP-Greg/rails,illacceptanything/illacceptanything,lucasmazza/rails,illacceptanything/illacceptanything,kaspth/rails,pvalena/rails,Spin42/rails,riseshia/railsguides.kr,shioyama/rails,illacceptanything/illacceptanything,yalab/rails,coreyward/rails,Edouard-chin/rails,printercu/rails,mtsmfm/rails,rossta/rails,EmmaB/rails-1,eileencodes/rails,Vasfed/rails,gfvcastro/rails,xlymian/rails,sergey-alekseev/rails,betesh/rails,baerjam/rails,kmcphillips/rails,jeremy/rails,vassilevsky/rails,flanger001/rails,coreyward/rails,utilum/rails,gauravtiwari/rails,repinel/rails,odedniv/rails,amoody2108/TechForJustice,joonyou/rails,gavingmiller/rails,ttanimichi/rails,pschambacher/rails,yalab/rails,kenta-s/rails,untidy-hair/rails,matrinox/rails,mohitnatoo/rails,Edouard-chin/rails,rafaelfranca/omg-rails,riseshia/railsguides.kr,assain/rails,kmayer/rails,utilum/rails,elfassy/rails,bogdanvlviv/rails,matrinox/rails,palkan/rails,utilum/rails,gfvcastro/rails,Vasfed/rails,rails/rails,illacceptanything/illacceptanything,mtsmfm/railstest,Spin42/rails,ledestin/rails,Sen-Zhang/rails,travisofthenorth/rails,mathieujobin/reduced-rails-for-travis,arjes/rails,kaspth/rails,untidy-hair/rails,betesh/rails,baerjam/rails,tgxworld/rails,richseviora/rails,BlakeWilliams/rails,Vasfed/rails,88rabbit/newRails,bogdanvlviv/rails,deraru/rails,mijoharas/rails,baerjam/rails,yhirano55/rails,illacceptanything/illacceptanything,iainbeeston/rails,mtsmfm/railstest,pvalena/rails,hanystudy/rails,illacceptanything/illacceptanything,fabianoleittes/rails,elfassy/rails,pvalena/rails,yalab/rails,gauravtiwari/rails,vipulnsward/rails,deraru/rails,felipecvo/rails,marklocklear/rails,gfvcastro/rails,felipecvo/rails,gavingmiller/rails,jeremy/rails,amoody2108/TechForJustice,assain/rails,mechanicles/rails,kamipo/rails,travisofthenorth/rails,amoody2108/TechForJustice,notapatch/rails,lcreid/rails,88rabbit/newRails,elfassy/rails,stefanmb/rails,lcreid/rails,kmcphillips/rails,brchristian/rails,iainbeeston/rails,kddeisz/rails,voray/rails,alecspopa/rails,esparta/rails,utilum/rails,bogdanvlviv/rails,kirs/rails-1,kachick/rails,odedniv/rails,gavingmiller/rails,georgeclaghorn/rails,palkan/rails,yasslab/railsguides.jp,printercu/rails,kddeisz/rails,kamipo/rails,kddeisz/rails,koic/rails,illacceptanything/illacceptanything,xlymian/rails,tjschuck/rails,untidy-hair/rails,MSP-Greg/rails,assain/rails,yhirano55/rails,joonyou/rails,voray/rails,arjes/rails,koic/rails,lucasmazza/rails,travisofthenorth/rails,ledestin/rails,flanger001/rails,ngpestelos/rails,Erol/rails,sealocal/rails,starknx/rails,printercu/rails,bradleypriest/rails,maicher/rails,Edouard-chin/rails,pschambacher/rails,mathieujobin/reduced-rails-for-travis,tjschuck/rails,mechanicles/rails,vipulnsward/rails,rails/rails,flanger001/rails,kenta-s/rails,lcreid/rails,Sen-Zhang/rails,coreyward/rails,mohitnatoo/rails,kamipo/rails,hanystudy/rails,kirs/rails-1,mechanicles/rails,mtsmfm/railstest,illacceptanything/illacceptanything