​The `maintenance_nag()` function in WordPress displays a maintenance message to remind users to perform necessary updates

Retrieves the name of the highest priority template file that exists.

Learn how to use the WordPress 'load_textdomain()' function to easily add translations in multiple languages

Learn how to use the WordPress 'load_template()' function to dynamically load templates in your plugins or themes

Loads the translation data for the given script handle and text domain.

​The `load_script_textdomain()` function in WordPress allows you to specify the translated strings for a particular script by providing its handle and optional domain or path parameters

Learn how to use the WordPress 'load_plugin_textdomain()' PHP function to load a plugin's translated strings in this comprehensive article

Loads the translated strings for a plugin residing in the mu-plugins directory.

Learn how to use the WordPress `load_child_theme_textdomain()` function to load child theme translations in your plugins or themes