Fix toast saying "published" instead of "saved" after editing post in web UI (#26664)

app/javascript/mastodon/actions/compose.js

@@ -84,6 +84,7 @@ const messages = defineMessages({
   uploadErrorPoll:  { id: 'upload_error.poll', defaultMessage: 'File upload not allowed with polls.' },
   open: { id: 'compose.published.open', defaultMessage: 'Open' },
   published: { id: 'compose.published.body', defaultMessage: 'Post published.' },
+  saved: { id: 'compose.saved.body', defaultMessage: 'Post saved.' },
 });
 
 export const ensureComposeIsVisible = (getState, routerHistory) => {
@@ -244,7 +245,7 @@ export function submitCompose(routerHistory) {
       }
 
       dispatch(showAlert({
-        message: messages.published,
+        message: statusId === null ? messages.published : messages.saved,
         action: messages.open,
         dismissAfter: 10000,
         onClick: () => routerHistory.push(`/@${response.data.account.username}/${response.data.id}`),

app/javascript/mastodon/locales/en.json

@@ -137,6 +137,7 @@
   "compose.language.search": "Search languages...",
   "compose.published.body": "Post published.",
   "compose.published.open": "Open",
+  "compose.saved.body": "Post saved.",
   "compose_form.direct_message_warning_learn_more": "Learn more",
   "compose_form.encryption_warning": "Posts on Mastodon are not end-to-end encrypted. Do not share any sensitive information over Mastodon.",
   "compose_form.hashtag_warning": "This post won't be listed under any hashtag as it is not public. Only public posts can be searched by hashtag.",