Update the tool tip text for the Pin/Unpin buttons in the caption bubble

This CL updates the tool tip text for the Pin/Unpin buttons in the
caption bubble.

Bug: 1365859
Change-Id: I5976df1fafac312faa6d118d831ba40918b9d988
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3914453
Reviewed-by: Abigail Klein <[email protected]>
Commit-Queue: Evan Liu <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1052585}
diff --git a/components/live_caption_strings.grdp b/components/live_caption_strings.grdp
index 9fc9d45..f4fb054 100644
--- a/components/live_caption_strings.grdp
+++ b/components/live_caption_strings.grdp
@@ -16,6 +16,12 @@
   <message name="IDS_LIVE_CAPTION_BUBBLE_BACK_TO_TAB" desc="Tooltip for the Live Caption back-to-tab button. Clicking the button brings a user's focus back to the tab which is streaming the audio or video.">
     Back to tab
   </message>
+  <message name="IDS_LIVE_CAPTION_BUBBLE_PIN" desc="Tooltip for the Live Caption pin button.">
+    Pin
+  </message>
+  <message name="IDS_LIVE_CAPTION_BUBBLE_UNPIN" desc="Tooltip for the Live Caption unpin button.">
+    Unpin
+  </message>
   <message name="IDS_LIVE_CAPTION_BUBBLE_ERROR" desc="Error message for the Live Caption bubble when Live Captions are unavailable.">
     Live Caption is not available right now
   </message>