Add support for themes (fixes #1925)

gui/default/syncthing/core/selectOnClickDirective.js

@@ -0,0 +1,14 @@
+angular.module('syncthing.core')
+    .directive('selectOnClick', function ($window) {
+        return {
+            link: function (scope, element, attrs) {
+                element.on('click', function() {
+                    var selection = $window.getSelection();
+                    var range = document.createRange();
+                    range.selectNodeContents(element[0]);
+                    selection.removeAllRanges();
+                    selection.addRange(range);
+                });
+            }
+        };
+});