Update release notes

_locales/en/messages.json

@@ -9780,5 +9780,9 @@
   "icu:WhatsNew__7.79-2": {
     "messageformat": "Copy/paste improvements make it easier to select-all and replace existing text without inheriting the old formatting. Thanks, <brianHarder></brianHarder>!",
     "description": " Release notes for 7.79 release"
+  },
+  "icu:WhatsNew__7.80-1": {
+    "messageformat": "Signal polls are here! Are you and your friends on the same page, or are you poll-ar opposites? Polls are an easy way to see what your group chat really thinks. Create a poll with competing dinner options, vacation destinations, musical preferences for an upcoming road trip, or any other important choices. Everyone in the group can vote and see each other's responses, and you can decide whether or not to allow multiple votes.",
+    "description": "Release notes for 7.80 release"
   }
 }

ts/components/WhatsNewModal.dom.tsx

@@ -34,14 +34,6 @@ export function ExternalLink(props: {
   );
 }
 
-function BrianHarder() {
-  return (
-    <ExternalLink href="https://github.com/brianHarder">
-      @brianHarder
-    </ExternalLink>
-  );
-}
-
 export function WhatsNewModal({
   i18n,
   hideWhatsNewModal,
@@ -51,16 +43,7 @@ export function WhatsNewModal({
   const releaseNotes: ReleaseNotesType = {
     date: new Date(window.getBuildCreation?.() || Date.now()),
     version: window.getVersion?.(),
-    features: [
-      <I18n i18n={i18n} id="icu:WhatsNew__7.79-1" />,
-      <I18n
-        i18n={i18n}
-        id="icu:WhatsNew__7.79-2"
-        components={{
-          brianHarder: BrianHarder,
-        }}
-      />,
-    ],
+    features: [<I18n i18n={i18n} id="icu:WhatsNew__7.80-1" />],
   };
 
   if (releaseNotes.features.length === 1 && !releaseNotes.header) {