WordPress 4.6 significantly improves the way translations are loaded for plugins and themes which are hosted in the WordPress Plugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party and Theme Directory and using language packs via WordPress.org The community site where WordPress code is created and shared by the users. This is where you can download the source code for WordPress core, plugins and themes as well as the central location for community conversations and organization. https://wordpress.org/’s translation platform.
Loading Translations in Different Order
load_plugin_textdomain( $domain ) and
load_theme_textdomain( $domain ) are used to load the translations for a specific text domain, where
$domain equals the slug of your plugin or theme.
Up until now, these functions first looked inside the plugin/theme folder for available translations before checking the
wp-content/languages directory, where language packs reside. With WordPress 4.6, this order has been reversed.
The translation The process (or result) of changing text, words, and display formatting to support another language. Also see localization, internationalization. platform for plugins/themes was opened up in December last year. Since then 15,000 plugins and themes were imported and are now benefiting from automated translation updates. That’s why translation files are most likely to be located
wp-content/languages directory, hence this change. See  / #34213.
Just-in-time Loading for Translations
By far the biggest change is that you do not have to call
load_theme_textdomain() anymore with WordPress 4.6. Of course the same goes for
Again, since translations files are usually inside
wp-content/languages, WordPress now scans that directory for available translations and automatically loads them if it encounters a text domain for the first time. That’s handled by the new
_load_textdomain_just_in_time() function which gets called in
get_translations_for_domain(). See  / #34114.
This so-called just-in-time loading of text domains works really great and removes one more step for developers to worry about. If you do not want this to happen, however, you can still use the
override_load_textdomain filter Filters are one of the two types of Hooks https://codex.wordpress.org/Plugin_API/Hooks. They provide a way for functions to modify data of other functions. They are the counterpart to Actions. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output. to load your text domains manually.
Also, if you use
unload_textdomain() you will have to manually load translations afterwards if you want to use them again because it keeps a record of unloaded text domains.
Localized jQuery UI User interface datepicker
- Support for comment number declension in
get_comments_number_text(). See #13651.
- Fallback for
TextDomain header The header of your site is typically the first thing people will experience. The masthead or header art located across the top of your page is part of the look and feel of your website. It can influence a visitor’s opinion about your content and you/ your organization’s brand. It may also look different on different screen sizes. field in
get_plugin_data(). See #36706.
- Updated list of continents and cities for the timezone selector. See #37554.
- Support for the German (Switzerland) locale A locale is a combination of language and regional dialect. Usually locales correspond to countries, as is the case with Portuguese (Portugal) and Portuguese (Brazil). Other examples of locales include Canadian English and U.S. English. in
remove_accents(). See #37076.
- Improved support for month name declension. See #36790.
#4-6, #dev-notes, #i18n