Add default translation for emoji on the app to avoid lint complaints

app/src/main/res/values/strings.xml

@@ -228,6 +228,9 @@
     <string name="Guggy_Command_Description">Generates a gif based upon the provided text</string>
     <string name="Slash_Topic_Description">Set topic</string>
 
+    <!-- Emoji message-->
+    <string name="msg_no_recent_emoji">No recent emojis</string>
+
     <!-- Sorting and grouping-->
     <string name="menu_chatroom_sort">Sort</string>
     <string name="dialog_sort_title">Sort by</string>