diff --git a/common_config.php b/common_config.php
index 8391b5e..850bc6b 100644
--- a/common_config.php
+++ b/common_config.php
@@ -28,6 +28,7 @@ const DBPASS_PROSODY = 'YOUR_PASSWORD'; // Database password
 const DBNAME_PROSODY = 'prosody'; // Database
 
 const LANGUAGES = [
+	'cs' => ['name' => 'čeština', 'locale' => 'cs_CZ', 'flag' => '🇨🇿', 'show_in_menu' => true, 'dir' => 'ltr'],
 	'de' => ['name' => 'Deutsch', 'locale' => 'de_DE', 'flag' => '🇩🇪', 'show_in_menu' => true, 'dir' => 'ltr'],
 	'en' => ['name' => 'English', 'locale' => 'en_GB', 'flag' => '🇬🇧', 'show_in_menu' => true, 'dir' => 'ltr'],
 	'ru' => ['name' => 'Русский', 'locale' => 'ru_RU', 'flag' => '🇷🇺', 'show_in_menu' => true, 'dir' => 'ltr'],
diff --git a/locale/cs/LC_MESSAGES/mail-hosting.mo b/locale/cs_CZ/LC_MESSAGES/mail-hosting.mo
similarity index 100%
rename from locale/cs/LC_MESSAGES/mail-hosting.mo
rename to locale/cs_CZ/LC_MESSAGES/mail-hosting.mo
diff --git a/locale/cs/LC_MESSAGES/mail-hosting.po b/locale/cs_CZ/LC_MESSAGES/mail-hosting.po
similarity index 100%
rename from locale/cs/LC_MESSAGES/mail-hosting.po
rename to locale/cs_CZ/LC_MESSAGES/mail-hosting.po