Revert "Revert "show 'Installed' for a button if we know a user has installed it in the past (bug 815426)""
Revert "Revert "show 'Installed' for a button if we know a user has installed it in the past (bug 815426)""

This reverts commit 12c40e814dcd350c1d7b7b808be391b56b9b84a7.

Nolski/olympia,harry-7/addons-server,robhudson/zamboni,anaran/olympia,andymckay/olympia,harry-7/addons-server,kmaglione/olympia,Joergen/olympia,ddurst/zamboni,shahbaz17/zamboni,Joergen/olympia,jpetto/olympia,shahbaz17/zamboni,mstriemer/olympia,atiqueahmedziad/addons-server,mozilla/zamboni,eviljeff/olympia,Jobava/zamboni,johancz/olympia,beni55/olympia,mudithkr/zamboni,aviarypl/mozilla-l10n-addons-server,washort/zamboni,mdaif/olympia,wagnerand/addons-server,diox/olympia,ayushagrawal288/zamboni,diox/olympia,kumar303/addons-server,Witia1/olympia,Hitechverma/zamboni,psiinon/addons-server,yfdyh000/olympia,ngokevin/zamboni,ngokevin/zamboni,eviljeff/zamboni,Nolski/olympia,mstriemer/addons-server,wagnerand/olympia,muffinresearch/olympia,diox/olympia,bqbn/addons-server,jasonthomas/zamboni,mozilla/olympia,Revanth47/addons-server,tsl143/addons-server,ngokevin/zamboni,andymckay/olympia,kmaglione/olympia,psiinon/addons-server,andymckay/olympia,luckylavish/zamboni,mozilla/addons-server,yfdyh000/olympia,Joergen/zamboni,jpetto/olympia,kumar303/zamboni,clouserw/zamboni,washort/zamboni,jpetto/olympia,tsl143/zamboni,yfdyh000/olympia,magopian/olympia,muffinresearch/addons-server,johancz/olympia,koehlermichael/olympia,crdoconnor/olympia,crdoconnor/olympia,spasovski/zamboni,lavish205/olympia,jasonthomas/zamboni,washort/zamboni,bqbn/addons-server,mozilla/olympia,eviljeff/olympia,Joergen/olympia,wagnerand/zamboni,mdaif/olympia,ayushagrawal288/zamboni,Revanth47/addons-server,Joergen/zamboni,clouserw/zamboni,bqbn/addons-server,Witia1/olympia,Nolski/olympia,Joergen/olympia,muffinresearch/addons-server,kumar303/olympia,kumar303/olympia,wagnerand/zamboni,mstriemer/olympia,mozilla/olympia,diox/zamboni,muffinresearch/olympia,yfdyh000/olympia,Hitechverma/zamboni,Prashant-Surya/addons-server,crdoconnor/olympia,atiqueahmedziad/addons-server,mudithkr/zamboni,psiinon/addons-server,mstriemer/addons-server,koehlermichael/olympia,anaran/olympia,beni55/olympia,andymckay/olympia,mrrrgn/olympia,kumar303/olympia,luckylavish/zamboni,Prashant-Surya/addons-server,elysium001/zamboni,aviarypl/mozilla-l10n-addons-server,magopian/olympia,johancz/olympia,jamesthechamp/zamboni,andymckay/addons-server,mozilla/olympia,andymckay/zamboni,ingenioustechie/zamboni,mstriemer/zamboni,Jobava/zamboni,johancz/olympia,spasovski/zamboni,beni55/olympia,Jobava/zamboni,luckylavish/zamboni,mrrrgn/olympia,kumar303/zamboni,mrrrgn/olympia,SuriyaaKudoIsc/olympia,kumar303/zamboni,andymckay/addons-server,mdaif/olympia,ayushagrawal288/zamboni,ddurst/zamboni,harry-7/addons-server,anaran/olympia,clouserw/zamboni,wagnerand/addons-server,mstriemer/zamboni,atiqueahmedziad/addons-server,elysium001/zamboni,Nolski/olympia,Joergen/olympia,mudithkr/zamboni,wagnerand/olympia,robhudson/zamboni,diox/zamboni,Revanth47/addons-server,mozilla/addons-server,andymckay/addons-server,mstriemer/addons-server,clouserw/zamboni,tsl143/zamboni,wagnerand/zamboni,magopian/olympia,Hitechverma/zamboni,kumar303/addons-server,wagnerand/addons-server,jasonthomas/zamboni,shahbaz17/zamboni,harry-7/addons-server,robhudson/zamboni,lavish205/olympia,ayushagrawal288/zamboni,koehlermichael/olympia,mstriemer/zamboni,eviljeff/olympia,eviljeff/zamboni,magopian/olympia,koehlermichael/olympia,Joergen/zamboni,mrrrgn/olympia,johancz/olympia,Nolski/olympia,crdoconnor/olympia,mozilla/addons-server,koehlermichael/olympia,Witia1/olympia,muffinresearch/olympia,andymckay/addons-server,mrrrgn/olympia,harikishen/addons-server,wagnerand/zamboni,jpetto/olympia,luckylavish/zamboni,aviarypl/mozilla-l10n-addons-server,harikishen/addons-server,crdoconnor/olympia,muffinresearch/addons-server,mstriemer/addons-server,muffinresearch/olympia,harikishen/addons-server,wagnerand/olympia,kumar303/addons-server,mozilla/zamboni,tsl143/zamboni,Joergen/zamboni,lavish205/olympia,muffinresearch/addons-server,kumar303/zamboni,tsl143/addons-server,beni55/olympia,andymckay/zamboni,aviarypl/mozilla-l10n-addons-server,wagnerand/addons-server,mozilla/zamboni,jamesthechamp/zamboni,beni55/olympia,atiqueahmedziad/addons-server,tsl143/addons-server,kmaglione/olympia,Joergen/zamboni,eviljeff/zamboni,diox/zamboni,lavish205/olympia,mstriemer/olympia,ingenioustechie/zamboni,Revanth47/addons-server,bqbn/addons-server,eviljeff/zamboni,yfdyh000/olympia,ddurst/zamboni,ddurst/zamboni,anaran/olympia,elysium001/zamboni,kmaglione/olympia,Joergen/zamboni,kmaglione/olympia,mstriemer/zamboni,eviljeff/olympia,kumar303/olympia,Witia1/olympia,mdaif/olympia,SuriyaaKudoIsc/olympia,robhudson/zamboni,jamesthechamp/zamboni,Witia1/olympia,washort/zamboni,psiinon/addons-server,jasonthomas/zamboni,tsl143/addons-server,SuriyaaKudoIsc/olympia,SuriyaaKudoIsc/olympia,spasovski/zamboni,kumar303/addons-server,muffinresearch/olympia,tsl143/zamboni,diox/olympia,andymckay/zamboni,elysium001/zamboni,mdaif/olympia,Prashant-Surya/addons-server,mstriemer/olympia,spasovski/zamboni,Jobava/zamboni,shahbaz17/zamboni,harikishen/addons-server,mozilla/zamboni,ingenioustechie/zamboni,ingenioustechie/zamboni,jamesthechamp/zamboni,magopian/olympia,mudithkr/zamboni,diox/zamboni,muffinresearch/addons-server,wagnerand/olympia,mozilla/addons-server,Hitechverma/zamboni,Prashant-Surya/addons-server