fix

frontend/views/layouts/head.php

 <?php 
 
 use common\modules\languages\models\Languages;
-
-$langs = Languages::find()->where(['!=', 'id', Languages::getCurrent()->id])->all();
+$currentLang = Languages::getCurrent();
+$langs = Languages::find()->where(['!=', 'id', $currentLang->id])->all();
 ?>	
 
 <meta name="keywords" content="<?php echo \Yii::$app->controller->meta_keywords?>">
@@ -14,7 +14,10 @@ $langs = Languages::find()->where(['!=', 'id', Languages::getCurrent()->id])->al
     foreach ($langs as $lang) : $url = \Yii::$app->request->getLangUrl(); ?>
     	<link rel="alternate" hreflang="<?=$lang->url?>" href="<?= yii\helpers\Url::to((!$lang->default?'/'.$lang->url:'').$url, true) ?>" />
     <?php endforeach;
-endif; ?>
+    if ($currentLang->default) : ?>
+        <link rel="canonical" href="<?= yii\helpers\Url::to(\Yii::$app->request->getLangUrl(), true) ?>" />
+    <?php endif;
+endif;?>
 
 <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
 <link rel="apple-touch-icon" href="/images/favicon/apple-touch-icon.png">

frontend/views/layouts/main.php

 <?php
+use common\modules\languages\models\Languages;
 use yii\helpers\Html;
 use yii\bootstrap\Nav;
 use yii\bootstrap\NavBar;

frontend/web/.htaccess

@@ -12,6 +12,10 @@ RewriteCond %{REQUEST_FILENAME} !-d
 
 RewriteRule . index.php
 
+RewriteCond %{REQUEST_URI} /index.php
+RewriteCond %{QUERY_STRING} ^\z
+RewriteRule ^(.*)$ https://task-on.com/? [R=301,L]
+
 <IfModule mod_expires.c>
   <FilesMatch \.(gif|png|jpg|jpeg|ogg|mp4|mkv|flv|swf|wmv|asf|asx|wma|wax|wmx|wm)$>
     ExpiresDefault "access plus 1 year"

frontend/web/css/custom.css

@@ -2733,7 +2733,7 @@ width: 95%;
 .round_schedule_ins_ul {
   padding-left: 0;
 }
-..round_schedule_ins_ul li {
+.round_schedule_ins_ul li {
   line-height: 24px;
 }
 /*#chart-container text, #chart-container tspan {