security: Use proper method to escape html.

Now using the `escape-html` module so that we can decode
the realm description properly and escape the html at the
same time. The encodeURIComponent function doesn't
provide this kind of flexibility. We need to decode the
real description properly since we show the same in the
tooltip and setting page.

app/renderer/js/utils/domain-util.js

@@ -5,6 +5,8 @@ const fs = require('fs');
 const path = require('path');
 const JsonDB = require('node-json-db');
 const request = require('request');
+const escape = require('escape-html');
+
 const Logger = require('./logger-util');
 
 const logger = new Logger({
@@ -188,7 +190,7 @@ class DomainUtil {
 							// Following check handles both the cases
 							icon: data.realm_icon.startsWith('/') ? data.realm_uri + data.realm_icon : data.realm_icon,
 							url: data.realm_uri,
-							alias: encodeURIComponent(data.realm_name)
+							alias: escape(data.realm_name)
 						});
 					}
 				} else {