Revert "Don't word-wrap in article titles"

This reverts commit 15268ef4f6748609126fdf29df50df2bf5f93855.

Unfortunately, it's not really usable on a mobile phone because most
titles are truncated.

ui/static/css/common.css

@@ -693,16 +693,6 @@ template {
     box-shadow: var(--current-item-box-shadow);
 }
 
-.item-header {
-    display: flex;
-}
-
-.item-title {
-    overflow-x: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
-}
-
 .item-title a {
     text-decoration: none;
     font-weight: var(--item-title-link-font-weight);