Fix bug 1337123: Update newsletter sign-up language to avoid confusion
Fix bug 1337123: Update newsletter sign-up language to avoid confusion

TheoChevalier/bedrock,pascalchevrel/bedrock,sgarrity/bedrock,hoosteeno/bedrock,ericawright/bedrock,sylvestre/bedrock,flodolo/bedrock,sgarrity/bedrock,TheoChevalier/bedrock,ericawright/bedrock,mozilla/bedrock,CSCI-462-01-2017/bedrock,sylvestre/bedrock,Sancus/bedrock,alexgibson/bedrock,CSCI-462-01-2017/bedrock,flodolo/bedrock,craigcook/bedrock,pascalchevrel/bedrock,mozilla/bedrock,mkmelin/bedrock,TheoChevalier/bedrock,alexgibson/bedrock,mkmelin/bedrock,flodolo/bedrock,ericawright/bedrock,sylvestre/bedrock,craigcook/bedrock,sylvestre/bedrock,Sancus/bedrock,kyoshino/bedrock,schalkneethling/bedrock,MichaelKohler/bedrock,flodolo/bedrock,gerv/bedrock,sgarrity/bedrock,gerv/bedrock,MichaelKohler/bedrock,ericawright/bedrock,kyoshino/bedrock,Sancus/bedrock,craigcook/bedrock,TheoChevalier/bedrock,schalkneethling/bedrock,mkmelin/bedrock,CSCI-462-01-2017/bedrock,sgarrity/bedrock,gerv/bedrock,hoosteeno/bedrock,hoosteeno/bedrock,MichaelKohler/bedrock,Sancus/bedrock,pascalchevrel/bedrock,gerv/bedrock,schalkneethling/bedrock,hoosteeno/bedrock,pascalchevrel/bedrock,CSCI-462-01-2017/bedrock,mozilla/bedrock,kyoshino/bedrock,kyoshino/bedrock,craigcook/bedrock,alexgibson/bedrock,mkmelin/bedrock,schalkneethling/bedrock,mozilla/bedrock,MichaelKohler/bedrock,alexgibson/bedrock