fix(sms): Update SMS legal text to cover more countries. (#5034) r=@philbooth
fix(sms): Update SMS legal text to cover more countries. (#5034) r=@philbooth

SMS legal text is made more generic to cover any country
for which the feature is enabled.

fixes #4945
shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server