diff --git a/resources/views/emails/confirm_html.blade.php b/resources/views/emails/confirm_html.blade.php
index e2e94d7fda51..fe4b73a847aa 100644
--- a/resources/views/emails/confirm_html.blade.php
+++ b/resources/views/emails/confirm_html.blade.php
@@ -1,4 +1,8 @@
-<html>
+<!DOCTYPE html>
+<html lang="{{ App::getLocale() }}">
+<head>
+  <meta charset="utf-8">
+</head>
 <body>
 @if (false && !$invitationMessage)
     @include('emails.confirm_action', ['user' => $user])
diff --git a/resources/views/emails/invoice_html.blade.php b/resources/views/emails/invoice_html.blade.php
index 92f5f1a3f9b0..a0d2526a6e26 100644
--- a/resources/views/emails/invoice_html.blade.php
+++ b/resources/views/emails/invoice_html.blade.php
@@ -1,4 +1,8 @@
-<html>
+<!DOCTYPE html>
+<html lang="{{ App::getLocale() }}">
+<head>
+  <meta charset="utf-8">
+</head>
 <body>
     @if (false)
         @include('emails.view_action', ['link' => $link, 'entityType' => $entityType])
diff --git a/resources/views/emails/invoice_paid_html.blade.php b/resources/views/emails/invoice_paid_html.blade.php
index 001ab0796e21..07e478b0338d 100644
--- a/resources/views/emails/invoice_paid_html.blade.php
+++ b/resources/views/emails/invoice_paid_html.blade.php
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="{{ App::getLocale() }}">
 <head>
   <meta charset="utf-8">
 </head>
diff --git a/resources/views/emails/invoice_sent_html.blade.php b/resources/views/emails/invoice_sent_html.blade.php
index 5ee266c7d203..3426820e1db3 100644
--- a/resources/views/emails/invoice_sent_html.blade.php
+++ b/resources/views/emails/invoice_sent_html.blade.php
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="{{ App::getLocale() }}">
 <head>
   <meta charset="utf-8">
 </head>
diff --git a/resources/views/emails/invoice_viewed_html.blade.php b/resources/views/emails/invoice_viewed_html.blade.php
index 957b6bff8efa..60fd6faaae65 100644
--- a/resources/views/emails/invoice_viewed_html.blade.php
+++ b/resources/views/emails/invoice_viewed_html.blade.php
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="{{App::getLocale()}}">
+<html lang="{{ App::getLocale() }}">
 <head>
   <meta charset="utf-8">
 </head>
diff --git a/resources/views/emails/license_confirmation_html.blade.php b/resources/views/emails/license_confirmation_html.blade.php
index 172e299e3f77..f7950158958c 100644
--- a/resources/views/emails/license_confirmation_html.blade.php
+++ b/resources/views/emails/license_confirmation_html.blade.php
@@ -1,18 +1,18 @@
 <!DOCTYPE html>
-<html>
-    <head>
-        <meta charset="utf-8">
-    </head>
-    <body>
+<html lang="{{ App::getLocale() }}">
+<head>
+  <meta charset="utf-8">
+</head>
+<body>
 
-      {{ $client }},<p/>
+  {{ $client }},<p/>
 
-      {{ trans('texts.payment_message', ['amount' => $amount]) }}<p/>      
+  {{ trans('texts.payment_message', ['amount' => $amount]) }}<p/>      
 
-      {{ $license }}<p/>
+  {{ $license }}<p/>
 
-      {{ trans('texts.email_signature') }}<br/>      
-      {{ $account }}
-      
-    </body>
+  {{ trans('texts.email_signature') }}<br/>      
+  {{ $account }}
+  
+</body>
 </html>
\ No newline at end of file
diff --git a/resources/views/emails/payment_confirmation_html.blade.php b/resources/views/emails/payment_confirmation_html.blade.php
index 4459df93e100..7e944a2f39fb 100644
--- a/resources/views/emails/payment_confirmation_html.blade.php
+++ b/resources/views/emails/payment_confirmation_html.blade.php
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
-<html>
-    <head>
-        <meta charset="utf-8">
-    </head>
-    <body>{!! $body !!}</body>
+<html lang="{{ App::getLocale() }}">
+<head>
+  <meta charset="utf-8">
+</head>
+<body>{!! $body !!}</body>
 </html>
diff --git a/resources/views/emails/quote_approved_html.blade.php b/resources/views/emails/quote_approved_html.blade.php
index a9daf05981d8..4f1396a1a81b 100644
--- a/resources/views/emails/quote_approved_html.blade.php
+++ b/resources/views/emails/quote_approved_html.blade.php
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="{{ App::getLocale() }}">
 <head>
   <meta charset="utf-8">
 </head>
