consistent naming

Author: markvaneijk

src/Resources/MailResource.php

@@ -47,12 +47,12 @@ public static function getModel(): string
 
     public static function getNavigationGroup(): ?string
     {
-        return __('Mails');
+        return __('Emails');
     }
 
     public static function getNavigationLabel(): string
     {
-        return __('Mails');
+        return __('Emails');
     }
 
     public static function getLabel(): ?string
@@ -67,7 +67,7 @@ public static function getNavigationIcon(): string
 
     public function getTitle(): string
     {
-        return __('Mails');
+        return __('Emails');
     }
 
     public static function infolist(Infolist $infolist): Infolist

src/Resources/MailResource/Pages/ListMails.php

@@ -18,7 +18,7 @@ public static function getResource(): string
 
     public function getTitle(): string
     {
-        return __('Mails');
+        return __('Emails');
     }
 
     protected function getActions(): array