change language tag in template

luser/templates/changepassword.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="sr">
+<html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">

luser/templates/register.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="sr">
+<html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">

luser/templates/unregister.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="sr">
+<html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">