diff --git a/src/messenger/webim/libs/common/response.php b/src/messenger/webim/libs/common/response.php
index 1db5f363..e77917e2 100644
--- a/src/messenger/webim/libs/common/response.php
+++ b/src/messenger/webim/libs/common/response.php
@@ -130,6 +130,37 @@ function get_additional_js($page_name) {
 	return implode("\n", $result);
 }
 
+/**
+ * Add additional localized strings for JavaScript application
+ *
+ * Triggers 'pageAddLocalizedStrings' and pass listeners associative array with
+ * following keys:
+ *  - 'page': string, name of page to which localized strings will be added.
+ *  - 'localized_strings': associative array with localized strings.
+ *
+ * @param string $page_name Localized strings add to this page
+ * @return string JSON encoded localized strings
+ */
+function get_additional_localized_strings($page_name) {
+	// Prepare event arguments array
+	$args = array(
+		'page' => $page_name,
+		'localized_strings' => array()
+	);
+
+	// Trigger event
+	$dispatcher = EventDispatcher::getInstance();
+	$dispatcher->triggerEvent('pageAddLocalizedStrings', $args);
+
+	// Build result
+	$result = array();
+	if (! empty($args['localized_strings'])
+		&& is_array($args['localized_strings'])) {
+		$result = $args['localized_strings'];
+	}
+
+	return json_encode($result);
+}
 
 /**
  * Build Javascript code that contains initializing options for JavaScript
@@ -166,6 +197,8 @@ function get_js_plugin_options($page_name) {
  * @return array Associative array of plugins data. It contains following keys:
  *  - 'additional_css': contains results of the 'get_additional_css function
  *  - 'additional_js': contains results of the 'get_additional_js' function
+ *  - 'additional_localized_strings': contains results of the
+ *    'get_additional_localized_strings' function
  *  - 'js_plugin_options': contains results of the 'get_js_plugin_options'
  *    function
  */
@@ -173,6 +206,7 @@ function get_plugins_data($page_name) {
 	return array(
 		'additional_css' => get_additional_css($page_name),
 		'additional_js' => get_additional_js($page_name),
+		'additional_localized_strings' => get_additional_localized_strings($page_name),
 		'js_plugin_options' => get_js_plugin_options($page_name)
 	);
 }
diff --git a/src/messenger/webim/operator/users.php b/src/messenger/webim/operator/users.php
index b119150c..8e5e44a9 100644
--- a/src/messenger/webim/operator/users.php
+++ b/src/messenger/webim/operator/users.php
@@ -52,10 +52,8 @@ $page['coreStyles.trackedVisitorWindowParams'] = $style_config['tracked']['visit
 $page['coreStyles.inviteWindowParams'] = $style_config['invitation']['window_params'];
 $page['coreStyles.banWindowParams'] = $style_config['ban']['window_params'];
 
-// Get additional files
-$page['additional_css'] = get_additional_css('users');
-$page['additional_js'] = get_additional_js('users');
-$page['js_plugin_options'] = get_js_plugin_options('users');
+// Get additional plugins data
+$page = array_merge($page, get_plugins_data('users'));
 
 prepare_menu($operator);
 start_html_output();
diff --git a/src/messenger/webim/styles/dialogs/default/templates/chat.tpl b/src/messenger/webim/styles/dialogs/default/templates/chat.tpl
index 0918e87d..55f64a69 100644
--- a/src/messenger/webim/styles/dialogs/default/templates/chat.tpl
+++ b/src/messenger/webim/styles/dialogs/default/templates/chat.tpl
@@ -31,6 +31,7 @@
 
         ${page:additional_js}
         <script type="text/javascript"><!--
+            // Localized strings for the core
             Mibew.Localization.set({
                 'chat.close.confirmation': ${msgjs:chat.close.confirmation},
                 'typing.remote': ${msgjs:typing.remote},
@@ -70,6 +71,8 @@
                 'presurvey.title': ${msgjs:presurvey.title},
                 'presurvey.intro': ${msgjs:presurvey.intro}
             });
+            // Plugins localization
+            Mibew.Localization.set(${page:additional_localized_strings});
         //--></script>
 
         <!-- Run application -->
diff --git a/src/messenger/webim/view/pending_users.php b/src/messenger/webim/view/pending_users.php
index e8b2eb6a..c317101a 100644
--- a/src/messenger/webim/view/pending_users.php
+++ b/src/messenger/webim/view/pending_users.php
@@ -46,6 +46,7 @@ function tpl_header() { global $page, $webimroot;
 
 <!-- Localization constants -->
 <script type="text/javascript"><!--
+	// Localized strings for the core
 	Mibew.Localization.set({
 		'pending.table.speak': "<?php echo getlocal('pending.table.speak') ?>",
 		'pending.table.view': "<?php echo getlocal('pending.table.view') ?>",
@@ -86,6 +87,8 @@ function tpl_header() { global $page, $webimroot;
 		'chat.client.spam.prefix': "<?php echo getstring('chat.client.spam.prefix'); ?>",
 		'pending.errors.network': "<?php echo getlocal('pending.errors.network'); ?>"
 	});
+	// Plugins localization
+	Mibew.Localization.set(<?php echo $page['additional_localized_strings']; ?>);
 //--></script>
 
 <script type="text/javascript"><!--