Use same tooltips for column description and task footer.

assets/js/src/base.js

@@ -192,6 +192,22 @@ var Kanboard = (function() {
             $(".column-tooltip").tooltip({
                 content: function() {
                     return '<div class="markdown">' + $(this).attr("title") + '</div>';
+                },
+                position: {
+                    my: 'left-20 top',
+                    at: 'center bottom+9',
+                    using: function(position, feedback) {
+
+                        $(this).css(position);
+
+                        var arrow_pos = feedback.target.left + feedback.target.width / 2 - feedback.element.left - 20;
+
+                        $("<div>")
+                            .addClass("tooltip-arrow")
+                            .addClass(feedback.vertical)
+                            .addClass(arrow_pos == 0 ? "align-left" : "align-right")
+                            .appendTo(this);
+                    }
                 }
             });