UI/UX: Use dedicated icon for online user profile button

Update license file accordingly, also fix some missing/incorrect documentation of licenses.

data/gui/icons/licenses.txt

@@ -92,9 +92,37 @@ License: CC-BY-SA 3.0
 Comment:
  with elements by Totoplus62
 
-Files: menu_story.png
-Copyright: tavariz91
-License: CC0
+Files:
+ menu_addons*
+ menu_multi*
+ menu_race*
+Copyright: Dakal, SuperTuxKart dev team
+License: CC-BY-SA 3.0
+Comment:
+ Background by Dakal, from https://forum.freegamedev.net/viewtopic.php?f=18&t=585
+ Statement of license of background: https://forum.freegamedev.net/viewtopic.php?f=18&t=585&start=50#p8792
+ Icons come from set made by onyum.com (see above)
+
+Files:
+ online/menu_online_player*
+Copyright: Dakal, yeKcim, SuperTuxKart dev team
+License: CC-BY-SA 3.0
+Comment:
+ Background by Dakal, from https://forum.freegamedev.net/viewtopic.php?f=18&t=585
+ Statement of license of background: https://forum.freegamedev.net/viewtopic.php?f=18&t=585&start=50#p8792
+ Player icon from set made by onyum.com (see above)
+ Globe icon by yeKcim
+
+Files:
+ menu_story*
+ menu_online*
+Copyright: tavariz91, Dakal
+License: CC-BY-SA 3.0
+Comment:
+ Background by Dakal, from https://forum.freegamedev.net/viewtopic.php?f=18&t=585
+ Statement of license of background: https://forum.freegamedev.net/viewtopic.php?f=18&t=585&start=50#p8792
+ Earth icon based on https://openclipart.org/detail/3320/earth (CC0), edited by tavariz91
+ Story book icon by tavariz91 from https://forum.freegamedev.net/viewtopic.php?f=18&t=4401&start=25#p45564 (CC0)
 
 Files:
  crown.png

data/gui/screens/online/lan.stkgui

@@ -17,11 +17,6 @@
             <icon-button id="create_lan_server" width="128" height="128"
                          icon="gui/icons/online/menu_create_server.png" focus_icon="gui/icons/online/menu_create_server_hover.png"
                          I18N="In the online multiplayer screen" text="Create Server"/>
-                         <!--
-            <icon-button id="manage_user" width="128" height="128"
-                         icon="gui/icons/options_players.png"
-                         I18N="In the online multiplayer screen" text="Users"/>
-                         -->
         </buttonbar>
 
         <spacer height="5%" width="10"/>

data/gui/screens/online/online.stkgui

@@ -29,7 +29,7 @@
                          icon="gui/icons/online/menu_quick_play.png" focus_icon="gui/icons/online/menu_quick_play_hover.png"
                          I18N="Networking menu button" text="Enter server address" word_wrap="true"/>
             <icon-button id="online" width="128" height="128"
-                         icon="gui/icons/menu_online.png" focus_icon="gui/icons/menu_online_focus.png"
+                         icon="gui/icons/online/menu_online_player.png" focus_icon="gui/icons/online/menu_online_player_focus.png"
                          I18N="Networking menu button" text="Your profile" word_wrap="true"/>
         </buttonbar>