added error message when trying to sign up with gitlab using an email already used in the system
added error message when trying to sign up with gitlab using an email already used in the system

HackerHappyHour/platform,cadecairos/mattermoz,npcode/platform,ninja-/platform,FabianFrancoRoldan/platform,HackerHappyHour/platform,jmptrader/platform,FabianFrancoRoldan/platform,fosstp/platform,LAndreas/platform,HackerHappyHour/platform,kernicPanel/platform,cagomezt/platform,folpindo/platform,killix/platform,xogeny/platform,bkeroack/platform,sharp/platform,raghavenc5/TabGen,yaoyasong/platform,michaelkacher/platform,justyns/platform,42wim/platform,kitgary/platform,ttyniwa/platform,ninja-/platform,sharp/platform,narita-takeru/platform,hustlzp/platform,trashcan/platform,hungle90/platform,gluwaile/platform,StateFarmIns/mattermost,dimitertodorov/platform,ttyniwa/platform,cyanlime/platform,Huangyan9188/platform,cadecairos/mattermoz,Huangyan9188/platform,lawrenae/mattermost,stralsi/platform,folpindo/platform,jmptrader/platform,pokemonmegaman/platform,TSlean/platform,trigrass2/platform,StateFarmIns/mattermost,codevlabs/platform,gaev2003/platform,cadecairos/mattermoz,stralsi/platform,kitgary/platform,justyns/platform,dimitertodorov/platform,lawrenae/mattermost,asaadmahmoodspin/platform,yaoyasong/platform,folpindo/platform,rgarmsen2295/platform,rahulltkr/platform,folpindo/platform,pokemonmegaman/platform,baiwyc119/platform,florianorben/platform,ttyniwa/platform,davidkuhta/platform,bartuspan/platform,rompic/platform,trashcan/platform,driou/platform,bartuspan/platform,davidkuhta/platform,coraxster/platform,saitodisse/platform,driou/platform,oblank/platform,daizenberg/platform,codevlabs/platform,no2key/platform,trashcan/platform,codevlabs/platform,apaatsio/platform,asaadmahmoodspin/platform,rahulltkr/platform,FabianFrancoRoldan/platform,bartuspan/platform,kitgary/platform,raghavenc5/TabGen,harryross/platform,florianorben/platform,IQ2022/platform,ZBoxApp/platform,narita-takeru/platform,lawrenae/mattermost,justyns/platform,hustlzp/platform,narita-takeru/platform,michaelkacher/platform,baiwyc119/platform,ninja-/platform,ljshj/platform,cagomezt/platform,harryross/platform,sjmog/platform,killix/platform,coraxster/platform,no2key/platform,LawrenceHan/platform,hustlzp/platform,gluwaile/platform,hungle90/platform,cyanlime/platform,nota-ja/platform,dotcominternet/platform,fosstp/platform,lawrenae/mattermost,killix/platform,ljshj/platform,sharp/platform,coraxster/platform,wavelets/platform,saitodisse/platform,bartuspan/platform,dotcominternet/platform,rgarmsen2295/platform,ljshj/platform,gluwaile/platform,hungle90/platform,driou/platform,mozilla/mattermoz,jmptrader/platform,andela/mattermost-platform,oblank/platform,TSlean/platform,michaelkacher/platform,nota-ja/platform,LawrenceHan/platform,dotcominternet/platform,stralsi/platform,kernicPanel/platform,ttyniwa/platform,florianorben/platform,gaev2003/platform,ZBoxApp/platform,ZBoxApp/platform,jdeng/platform,killix/platform,florianorben/platform,yaoyasong/platform,HackerHappyHour/platform,baiwyc119/platform,npcode/platform,xogeny/platform,numericube/platform,andela/mattermost-platform,cyanlime/platform,bartuspan/platform,andela/mattermost-platform,mozilla/mattermoz,sjmog/platform,numericube/platform,IQ2022/platform,cagomezt/platform,trigrass2/platform,pokemonmegaman/platform,sjmog/platform,no2key/platform,cadecairos/mattermoz,michaelkacher/platform,michaelkacher/platform,narita-takeru/platform,bkeroack/platform,rgarmsen2295/platform,wavelets/platform,driou/platform,FabianFrancoRoldan/platform,sjmog/platform,asaadmahmoodspin/platform,LAndreas/platform,trigrass2/platform,harryross/platform,xogeny/platform,IQ2022/platform,bkeroack/platform,oblank/platform,jdeng/platform,samogot/platform,codevlabs/platform,mozilla/mattermoz,driou/platform,oblank/platform,stralsi/platform,killix/platform,cagomezt/platform,bkeroack/platform,ljshj/platform,raghavenc5/TabGen,codevlabs/platform,wavelets/platform,gluwaile/platform,davidkuhta/platform,TSlean/platform,sharp/platform,42wim/platform,nota-ja/platform,mozilla/mattermoz,rompic/platform,oblank/platform,ninja-/platform,ninja-/platform,Huangyan9188/platform,ttyniwa/platform,LawrenceHan/platform,yaoyasong/platform,rahulltkr/platform,bkeroack/platform,tbolon/platform,yaoyasong/platform,coraxster/platform,gluwaile/platform,jmptrader/platform,hustlzp/platform,IQ2022/platform,cadecairos/mattermoz,samogot/platform,apaatsio/platform,nota-ja/platform,baiwyc119/platform,LawrenceHan/platform,gaev2003/platform,cyanlime/platform,justyns/platform,tbalthazar/platform,stralsi/platform,npcode/platform,sjmog/platform,rgarmsen2295/platform,tbolon/platform,fosstp/platform,LAndreas/platform,daizenberg/platform,TSlean/platform,davidkuhta/platform,narita-takeru/platform,StateFarmIns/mattermost,jdeng/platform,saitodisse/platform,apaatsio/platform,mozilla/mattermoz,numericube/platform,rompic/platform,ZBoxApp/platform,xogeny/platform,florianorben/platform,StateFarmIns/mattermost,saitodisse/platform,wavelets/platform,pokemonmegaman/platform,tbolon/platform,jdeng/platform,harryross/platform,nota-ja/platform,hustlzp/platform,trigrass2/platform,andela/mattermost-platform,kernicPanel/platform,raghavenc5/TabGen,hungle90/platform,LawrenceHan/platform,folpindo/platform,tbolon/platform,42wim/platform,StateFarmIns/mattermost,TSlean/platform,rgarmsen2295/platform,cagomezt/platform,raghavenc5/TabGen,tbalthazar/platform,wavelets/platform,jmptrader/platform,trigrass2/platform,daizenberg/platform,lawrenae/mattermost,coraxster/platform,saitodisse/platform,hungle90/platform,fosstp/platform,no2key/platform,jdeng/platform,gaev2003/platform,tbalthazar/platform,FabianFrancoRoldan/platform,samogot/platform,LAndreas/platform,ljshj/platform,Huangyan9188/platform,pokemonmegaman/platform,kernicPanel/platform,no2key/platform,davidkuhta/platform,LAndreas/platform,ZBoxApp/platform,kitgary/platform,apaatsio/platform,npcode/platform,dimitertodorov/platform,Huangyan9188/platform,rahulltkr/platform,kernicPanel/platform,IQ2022/platform,tbolon/platform,HackerHappyHour/platform,andela/mattermost-platform,baiwyc119/platform,sharp/platform,apaatsio/platform,trashcan/platform,harryross/platform,dotcominternet/platform,npcode/platform,trashcan/platform,justyns/platform,xogeny/platform,gaev2003/platform,kitgary/platform