refactor: namespace everything

src/includes/class-i18n.php

@@ -0,0 +1,43 @@
+<?php // phpcs:disable PEAR.NamingConventions.ValidClassName.Invalid
+/**
+ * File providing core `i18n` class.
+ *
+ * @package footnotes
+ * @since 1.5.0
+ * @since 2.8.0 Rename file from `language.php` to `class-footnotes-i18n.php`,
+ *                              rename `class/` sub-directory to `includes/`.
+ */
+
+namespace footnotes\includes;
+
+require_once plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-config.php';
+
+/**
+ * Class providing internationalization functionality.
+ *
+ * Loads and defines the internationalization files for this plugin so that it
+ * is ready for translation.
+ *
+ * @link https://translate.wordpress.org/projects/wp-plugins/footnotes/ GlotPress listing
+ *
+ * @package footnotes
+ * @since 1.5.0
+ * @since 2.8.0 Rename class from `Language` to `i18n`.
+ */
+class i18n {
+
+	/**
+	 * Load the plugin text domain for translation.
+	 *
+	 * @since  1.5.1
+	 * @since  2.8.0  Rename from `load()` to `load_plugin_textdomain()`. Remove unused `$p_str_language_code` parameter.
+	 */
+	public function load_plugin_textdomain() {
+		load_plugin_textdomain(
+			'footnotes',
+			false,
+			dirname( dirname( plugin_basename( __FILE__ ) ) ) . '/languages/'
+		);
+	}
+
+}