changed placeholder text on source /lookup page
changed placeholder text on source /lookup page

micahflee/securedrop,ehartsuyker/securedrop,garrettr/securedrop,heartsucker/securedrop,garrettr/securedrop,micahflee/securedrop,heartsucker/securedrop,conorsch/securedrop,ageis/securedrop,conorsch/securedrop,conorsch/securedrop,ageis/securedrop,garrettr/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,micahflee/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ageis/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ageis/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,micahflee/securedrop,garrettr/securedrop