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How to change the language form “en-US” to “en” by wordpres bogo

投稿日:2017年3月29日 更新日:



Hello everyone, It’s me candle.
In this time, I will show you to customize bogo plugins.
The bogo is wonderful plugin which can adapt the wordpress site to many languages as a simple.
but, there is a problem that you can’t choose general English.

When writing English articles, you may not always have to write it limited to country.
However, you can choose ‘en-UK’, ‘en-CA’ and ‘en-US’, but ‘en’ can not be chosen in bogo.

I checked the source code.
The bogo got a language list from wordpress function, and there is no general English in it.
So I used this method which select “en-US” language and replace the string to “en” when it is displayed.

It may be fixed in future development.

It is described that it is also possible for google’s official to choose ‘en’ for language.

Related article

Customize wordpress bogo plugin’s short code


Bogo plugin has been installed to wordpress.
You can edit wordpress theme.


Find out where en-US is displayed

First we find out where en-US is displayed
Open the web inspector ( development tool ) on the page translated to English in your blog.
Search “en-US” against DOM.

The first thing we can see is the lang value of the html tag.

<!DOCTYPE html>
<!–[if lt IE 7]>
<html class=”ie6″ lang=”en-US”> <![endif]–>
<!–[if IE 7]>
<html class=”i7″ lang=”en-US”> <![endif]–>
<!–[if IE 8]>
<html class=”ie” lang=”en-US”> <![endif]–>
<!–[if gt IE 8]><!–>
<html lang=”en-US”>

Next, we can see the “alternate” value of link tag in the header tag.

<link rel=”alternate” hreflang=”en-US” href=”http://localhost:8080/alice_blog/wp/en/2017/03/26/33/” />
<link rel=”alternate” hreflang=”ja” href=”http://localhost:8080/alice_blog/wp/2016/02/14/23/” />

The last one has en-US with class attribute at body tag, but even if you do not change it there is nothing to do with SEO.
You don’t change it.

In summary, you need to change the value of “lang” in html tag and the value of “alternate” from en-US to en

Chnage the lang value of html tag

For changing “lang” value of html tag, I refer to the following site.

Open the functions.php in the your theme folder. If it isn’t, you make it.
It is generally in the following places.

wp-content/themes/”theme name”/functions.php

After open it, write this.

add_filter( 'language_attributes', 'language_attributes_fix' );
function language_attributes_fix( $language_attributes ) {
  return str_replace('en-US','en', $language_attributes);

Save it and check the blog again.
It turns to lang=”en”.

Change the value of alternate

Let’s change the value of alternate to en.
Write this code in the same functions.php.

add_filter( 'bogo_rel_alternate_hreflang', 'bogo_rel_alternate_hreflang_fix' );
function bogo_rel_alternate_hreflang_fix($languages) {
 foreach ($languages as $key => $language ) {
   $languages[$key]["hreflang"] = str_replace('en-US', "en", $language["hreflang"]);
 return $languages;

To enhance the versatility of this source code, we loop “$languages” with foreach to replace all languages.
If you know where the location of “en-US” in the $languages array, the next code is better performance than before.

function bogo_rel_alternate_hreflang_fix($languages) {
$languages[1][“hreflang”] = str_replace(‘en-US’, “en”, $languages[1][“hreflang”]);
return $languages;

Please be careful, if you add or remove the translation language, the “en-US” position would be changed,.

The alternate value turns to en.

It’s over.


The displayed language in this way could be changed from en-US to en.


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I work in the venture company as a CTO. I start to write program in University, first I learned java, C++ and PHP. In the company, I'm developing web services by Rails. I do like to automation.