remove forced lowercase from extension, fix #4747, also coding style fixes

apps/files/css/files.css

@@ -84,9 +84,26 @@
 	background-color: rgb(240,240,240);
 }
 tbody a { color:#000; }
-span.extension, span.uploading, td.date { color:#999; }
-span.extension { text-transform:lowercase; -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=70)"; filter:alpha(opacity=70); opacity:.7; -webkit-transition:opacity 300ms; -moz-transition:opacity 300ms; -o-transition:opacity 300ms; transition:opacity 300ms; }
-tr:hover span.extension { -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)"; filter:alpha(opacity=100); opacity:1; color:#777; }
+
+span.extension, span.uploading, td.date {
+	color: #999;
+}
+span.extension {
+	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=70)";
+	filter: alpha(opacity=70);
+	opacity: .7;
+	-webkit-transition: opacity 300ms;
+	-moz-transition: opacity 300ms;
+	-o-transition: opacity 300ms;
+	transition: opacity 300ms;
+}
+tr:hover span.extension {
+	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
+	filter: alpha(opacity=100);
+	opacity: 1;
+	color: #777;
+}
+
 table tr.mouseOver td { background-color:#eee; }
 table th { height:24px; padding:0 8px; color:#999; }
 table th .name {