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/error.js

@@ -14,7 +14,7 @@ module.exports = function(state, emit) {
         </h1>
         <img class="my-12 h-48" src="${assets.get('error.svg')}" />
         <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"