journalist: unify button label caps
journalist: unify button label caps

Replace "select all" etc. with "Select All" to match with "Download
Unread" etc.

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