Add legal and final strings (#1185)

* add legal and final strings

* removed unneeded suffixes from string ids

* removed unused strings and simplified string ids for vnext-only strings

* reword nostreams option

app/ui/notFound.js

@@ -10,11 +10,11 @@ module.exports = function(state, emit) {
         class="flex flex-col items-center justify-center h-full w-full p-6 z-10 overflow-hidden md:rounded-lg md:shadow-big"
       >
         <h1 class="text-center font-bold my-2">
-          ${state.translate('expiredPageHeaderUpdate')}
+          ${state.translate('expiredTitle')}
         </h1>
         <img src="${assets.get('notFound.svg')}" class="my-12" />
         <p class="max-w-md text-center text-grey-darkest leading-normal">
-          ${state.translate('downloadFinishText')}
+          ${state.translate('trySendDescription')}
         </p>
         <p class="my-5">
           <a href="/" class="btn rounded-lg flex items-center" role="button"