add email_placeholder for group subscription url
add email_placeholder for group subscription url

labhackercd/loomio,wangjun/loomio,loomio/loomio,sicambria/loomio,FSFTN/Loomio,HadoDokis/loomio,digideskio/loomio,Collabforge/site-collabio,gvalerin/loomio,FSFTN/Loomio,annewchen/loomio,gvalerin/loomio,codingnutty/loomio,digideskio/loomio,doomergithub/loomio,annewchen/loomio,FSFTN/Loomio,loomio/loomio,codingnutty/loomio,Collabforge/site-collabio,aca13jmf/loomio,juliagra/loomio,Collabforge/site-collabio,labhackercd/loomio,isomerase/loomio,HadoDokis/loomio,juliagra/loomio,Collabforge/site-collabio,labhackercd/loomio,wangjun/loomio,FSFTN/Loomio,gvalerin/loomio,tachyons/loomio,sicambria/loomio,mlarghydracept/loomio,juliagra/loomio,juliagra/DBCloomio,aca13jmf/loomio,juliagra/DBCloomio,tachyons/loomio,piratas-ar/loomio,loomio/loomio,mhjb/loomio,doomergithub/loomio,doomergithub/loomio,HadoDokis/loomio,piratas-ar/loomio,isomerase/loomio,piratas-ar/loomio,codingnutty/loomio,juliagra/DBCloomio,wangjun/loomio,mhjb/loomio,kimihito/loomio,isomerase/loomio,mlarghydracept/loomio,digideskio/loomio,annewchen/loomio,HadoDokis/loomio,mhjb/loomio,loomio/loomio,aca13jmf/loomio,isomerase/loomio,kimihito/loomio,tachyons/loomio,kimihito/loomio,piratas-ar/loomio,mlarghydracept/loomio,labhackercd/loomio,sicambria/loomio,sicambria/loomio,mhjb/loomio,tachyons/loomio