import i18n, fix error in examples

examples/index.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="it">
+<html lang="en">
   <head>
     <meta charset="UTF-8" />
     <title>mailgo examples</title>

examples/index.it.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="it">
   <head>
     <meta charset="UTF-8" />
     <title>mailgo examples</title>