Extend translate-ui-bubble-options flag expiration

Bug: 976352
Change-Id: I0e8a1edd503654268c9b80f056107bf7bde88065
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898089Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Commit-Queue: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712694}

chrome/browser/flag-metadata.json

@@ -3406,7 +3406,7 @@
   {
     "name": "translate-ui-bubble-options",
     "owners": [ "hhw", "anthonyvd", "chrome-language@google.com" ],
-    "expiry_milestone": 78
+    "expiry_milestone": 82
   },
   {
     "name": "treat-unsafe-downloads-as-active-content",