fix: using lang attribute with empty string in html template (#5992)

fangbinwei · haoqunjiang · commit ed2cf2294f2c · 2021-01-06T14:36:47.000+08:00
Fixes #5945 `lang="en"` may be wrong to users, use empty string instead. See : h5bp/html5-boilerplate#1542
diff --git a/packages/@vue/cli-service-global/template/index.html b/packages/@vue/cli-service-global/template/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="">
   <head>
     <meta charset="utf-8">
     <title>Vue CLI App</title>
diff --git a/packages/@vue/cli-service/generator/template/public/index.html b/packages/@vue/cli-service/generator/template/public/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="">
   <head>
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
diff --git a/packages/@vue/cli-service/lib/config/index-default.html b/packages/@vue/cli-service/lib/config/index-default.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="">
   <head>
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
