Pascal Birchler

Thanks to language packs it’s easier than ever before to change the main language of your site. 
However, in some cases a single locale is not enough. When WordPress can’t find a translation for the active locale, it falls back to the original English strings. 
That’s a poor user experience for many non-English speakers.
This feature project aims to change that by letting users choose multiple languages for displaying WordPress in. 
That way you can set some sort of “fallback chain” where WordPress tries to load translations in your preferred order.
Please help us test this plugin and let us know if something is not working as you think it should.
Keyboard Shortcuts
<ul>
<li><code>Arrow Up</code>: Move selected locale one position up.</li>
<li><code>Arrow Down</code>: Move selected locale one position down.</li>
<li><code>Home</code>: Select first locale in the list.</li>
<li><code>End</code>: Select last locale in the list.</li>
<li><code>Backspace</code>/<code>Delete</code>: remove the selected locale from the list.</li>
<li><code>Alt+A</code>: Add the current locale from the dropdown to the list.</li>
</ul>
Note: the Preferred Languages UI needs to be focused in order for the keyboard shortcuts to work.
Merging Translations
Previously, only the first available translation for a given locale and domain will be loaded. 
However, when translations are incomplete, some strings might still be displayed in English. 
That’s a poor user experience as well.
To prevent this, Preferred Languages now automatically merges all incomplete translations in the list.
the <code>preferred_languages_merge_translations</code> filter can be used to opt out of this behavior. 
It provides three parameters:
<ol>
<li><code>$merge</code> – Whether translations should be merged. Defaults to <code>true</code>.</li>
<li><code>$domain</code> – The text domain</li>
<li><code>$current_locale</code> – The current locale.</li>
</ol>
<h4>Get Involved</h4>
Active development is taking place on <a href="https://github.com/swissspidy/preferred-languages" rel="nofollow ugc">GitHub</a>.
If you want to get involved, check out <a href="https://github.com/swissspidy/preferred-languages/issues" rel="nofollow ugc">open issues</a> and join the <a href="https://wordpress.slack.com/messages/core-i18n" rel="nofollow ugc">#core-i18n</a> channel on <a href="https://wordpress.slack.com/" rel="nofollow ugc">Slack</a>. If you don’t have a Slack account yet, you can sign up at <a href="https://make.wordpress.org/chat/" rel="nofollow ugc">make.wordpress.org/chat/</a>.

Preferred Languages

Esto es imprescindible para cualquier usuario no angloparlante. El estado de las traducciones es irregular y sería perfecto tener un segundo e incluso un tercer idioma local para cargar si algo falta en tu idioma local, y así que no salga media web en español - por ejemplo - y el resto en inglés.

Esto ya estaría en WordPress si los principales equipos de desarrollo no fuesen angloparlantes, y claro, para ellos no es una prioridad ni de lejos.

Imprescindible - Debería estar ya en WordPress

Thanks for Pascal to solve the problem of fallback languages. It is time to add it to the core and would show that WordPress is thinking globally.

In core, please

I think this should be in Core for websites with several possible languages. I like it very much! Specially I appreciate that each user can also choose languages from the selected languages. 
(I am developing a translation plugin for my own needs to use Google Translate to translate posts/pages and complement it.)

Very necessary in core


I honestly think that this should be a core feature of WP. 



The only thing wrong I notice is that when you are looking at the front end... The language of the admin bar changes into the site language but that's the only issue I have with this plugin at the time of writing. For the rest, it's a dream plugin.


Make this a core feature

Should be in the core!

Choose languages for displaying WordPress in, in order of preference.

DAEXT

The Hreflang Manager plugin provides you an easy and reliable method to implement hreflang in WordPress.
For more information on the technical use of hreflang, please consider reading the <a href="https://developers.google.com/search/docs/advanced/crawling/localized-versions" rel="nofollow ugc">official documentation provided by Google</a>.
<h3>Pro Version</h3>
A <a href="https://daext.com/hreflang-manager/" rel="nofollow ugc">Pro Version</a> of this plugin is available on our website with many additional features, like the ability to move the hreflang implementation in all the websites of the network, a maximum of 100 alternative versions of the page per connection, the ability to mass import hreflang data from a spreadsheet, and much more.
<h3>Features</h3>
<ul>
<li>Supports the hreflang implementation of different websites or the sub-sites of a WordPress network</li>
<li>Supports all the languages defined with <a href="https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes" rel="nofollow ugc">ISO_639-1</a></li>
<li>Supports all the scripts defined with <a href="https://en.wikipedia.org/wiki/ISO_15924" rel="nofollow ugc">ISO 15924</a></li>
<li>Supports all the countries defined with <a href="https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2" rel="nofollow ugc">ISO 3166-1 alpha-2</a></li>
<li>A maximum of 10 alternative versions of the page per connection</li>
<li>Includes a log system to verify the correct implementation in the front-end</li>
<li>Ability to select the default languages, scripts, and countries</li>
<li>Automatically deletes the hreflang data of the deleted posts</li>
</ul>
<h3>Credits</h3>
This plugin makes use of the following resources:
<ul>
<li><a href="https://select2.org/" rel="nofollow ugc">Select2</a> licensed under the MIT License</li>
</ul>
For each library you can find the actual copy of the license inside the folder used to store the library files.

Hreflang Manager – Hreflang Implementation for International SEO

The Hreflang Manager plugin provides you an easy and reliable method to implement hreflang in WordPress.

Preferred Languages vs Hreflang Manager – Hreflang Implementation for International SEO