Add ellipsis

res/static/style/layout.css

@@ -312,6 +312,7 @@ pre{
 	display: inline-block;
 	transition: box-shadow 0.3s, opacity 2s;
 	white-space: normal;
+	text-overflow: ellipsis;
 }
 .file_button:hover,
 .file_button_selected {

res/static/style/viewer.css

@@ -45,6 +45,7 @@ body{
 	overflow: hidden;
 	white-space: nowrap;
 	line-height: 2em;
+	text-overflow: ellipsis;
 }
 .file_viewer > .highlight_headerbar > .button_close_file_viewer {
 	flex-grow: 0;