in additional.css:
#ranks li {
background: url(https://data.bugabuse.net/images/sprites/rank-sprite.png) no-repeat top left;
}
.sprite-admin{ background-position: 0 0; width: 157px; height: 44px; }
.sprite-banned{ background-position: -207px 0; width: 157px; height: 44px; }
.sprite-bugabuser{ background-position: -414px 0; width: 157px; height: 44px; }
.sprite-coder{ background-position: -621px 0; width: 157px; height: 44px; }
.sprite-donator{ background-position: -828px 0; width: 157px; height: 44px; }
.sprite-exdonator{ background-position: -1035px 0; width: 157px; height: 44px; }
.sprite-hondonator{ background-position: -1242px 0; width: 157px; height: 44px; }
.sprite-legdonator{ background-position: -1449px 0; width: 157px; height: 44px; }
.sprite-member{ background-position: -1656px 0; width: 157px; height: 44px; }
.sprite-middleman{ background-position: -1863px 0; width: 157px; height: 44px; }
.sprite-moderator{ background-position: 0 -94px; width: 157px; height: 44px; }
.sprite-mudkip{ background-position: -207px -94px; width: 150px; height: 50px; }
.sprite-newcomer{ background-position: -407px -94px; width: 157px; height: 44px; }
.sprite-pikachu{ background-position: -614px -94px; width: 150px; height: 50px; }
.sprite-recoverer{ background-position: -814px -94px; width: 157px; height: 44px; }
.sprite-robot{ background-position: -1021px -94px; width: 150px; height: 50px; }
.sprite-snorlax{ background-position: -1221px -94px; width: 150px; height: 50px; }
.sprite-superdonator{ background-position: -1421px -94px; width: 157px; height: 44px; }
.sprite-unicorn{ background-position: -1628px -94px; width: 300px; height: 100px; }
for the actual rank:
<ul id="ranks"><li class="sprite-newcomer"></li></ul>
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}