Lobby icon update, icons taken from forum lobby icon request topic.

- JAP's ums2 icon (as ums.png)

- Zarael's fog/shroud icons (modified to add transparency)

- Zarael's disclosure triangles, key and qmark reload icon (modified
  with transparency)

- Zarael's A-Z sort icon, modified with transparency and with
  desaturated version as "off" icons

- group effort relation sort icon, with desaturated version as "off" icons

data/gui/default/window/lobby_main.cfg

@@ -177,7 +177,7 @@
 									{GAMELISTBOX_BODY_IMAGE "needs_password" "misc/key.png" _"Requires a password to join"}
 									{GAMELISTBOX_BODY_IMAGE "use_map_settings" "misc/ums.png" _"Use map settings"}
 									{GAMELISTBOX_BODY_IMAGE "reloaded" "misc/reloaded.png" _"Reloaded game"}
-									{GAMELISTBOX_BODY_IMAGE "no_era" "misc/red-x.png" _"Unknown era"}
+									{GAMELISTBOX_BODY_IMAGE "no_era" "misc/qmark.png" _"Unknown era"}
 									{GAMELISTBOX_BODY_IMAGE "vision_icon" "" ""}
 									{GAMELISTBOX_BODY_IMAGE "gold_icon" "themes/gold-t.png" _"Gold per village"}
 									{GAMELISTBOX_BODY_LABEL_TINY "gold_text" "265"}