Add note to translators.

Author: bmarty

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

@@ -1586,8 +1586,10 @@
     <string name="room_list_catchup_empty_title">You’re all caught up!</string>
     <string name="room_list_catchup_empty_body">You have no more unread messages</string>
     <string name="room_list_people_empty_title">Conversations</string>
+    <!-- Note to translators: for RTL languages, the + will be at the bottom left. Please translate "bottom left" instead of "bottom right". Thanks! -->
     <string name="room_list_people_empty_body">Your direct message conversations will be displayed here. Tap the + at the bottom right to start some.</string>
     <string name="room_list_rooms_empty_title">Rooms</string>
+    <!-- Note to translators: for RTL languages, the + will be at the bottom left. Please translate "bottom left" instead of "bottom right". Thanks! -->
     <string name="room_list_rooms_empty_body">Your rooms will be displayed here. Tap the + at the bottom right to find existing ones or start some of your own.</string>
 
     <string name="title_activity_emoji_reaction_picker">Reactions</string>