Fix typo in empty chirp error message

fe1-web/src/resources/strings.ts

@@ -159,7 +159,7 @@ namespace STRINGS {
   export const social_media_create_chirp_no_pop_token =
     'In order to post chirps, you first need to participate in a roll-call.';
   export const social_media_empty_chirp =
-    'You chirp will be cropped to an empty chirp. You cannot send an empty chirp.';
+    'Your chirp will be cropped to an empty chirp. You cannot send an empty chirp.';
   export const social_media_user_list_unavailable =
     'In order to see other roll call participants you yourself first need to participate in one.';
   export const social_media_your_profile_unavailable =