Mainmenu: Improve "Join Game" tab (#11078)

LICENSE.txt

@@ -14,6 +14,9 @@ https://www.apache.org/licenses/LICENSE-2.0.html
 Textures by Zughy are under CC BY-SA 4.0
 https://creativecommons.org/licenses/by-sa/4.0/
 
+textures/base/pack/server_public.png is under CC-BY 4.0, taken from Twitter's Twemoji set
+https://creativecommons.org/licenses/by/4.0/
+
 Authors of media files
 -----------------------
 Everything not listed in here:
@@ -39,10 +42,10 @@ erlehmann:
   misc/minetest.svg
   textures/base/pack/logo.png
 
-JRottm
+JRottm:
   textures/base/pack/player_marker.png
 
-srifqi
+srifqi:
   textures/base/pack/chat_hide_btn.png
   textures/base/pack/chat_show_btn.png
   textures/base/pack/joystick_bg.png
@@ -58,6 +61,9 @@ Zughy:
   textures/base/pack/cdb_update.png
   textures/base/pack/cdb_viewonline.png
 
+appgurueu:
+  textures/base/pack/server_incompatible.png
+
 License of Minetest source code
 -------------------------------