Change regional language codes (#8065)

* Change regional language codes

According to `ISO-639-1` and `ISO-3166-1 alpha-2` recommendations, regional
languages must be written with the language code in lowercase and the region
in uppercase. For instance, we should have `en-US` instead of `en-us`.

Folders have been updated to reflect those recommendations and regional
language codes have been updated in the translation files.

* Update README files

* Fix configuration for typos

* Revert language order in documentation

* Remove unnecessary code

* Change language configuration getter

* Fix phpstan error

* Fix typo

* Add types

* escape regex

* Move language logic to avoid magic or deprecated methods

* Minor fix on regex

1 files changed, 110 insertions, 0 deletions

diff --git a/app/i18n/zh-TW/index.php b/app/i18n/zh-TW/index.php
new file mode 100644
index 000000000..4fcae7478
--- /dev/null
+++ b/app/i18n/zh-TW/index.php
@@ -0,0 +1,110 @@
+<?php
+
+/******************************************************************************
+ * Each entry of that file can be associated with a comment to indicate its   *
+ * state. When there is no comment, it means the entry is fully translated.   *
+ * The recognized comments are (comment matching is case-insensitive):        *
+ *   + TODO: the entry has never been translated.                             *
+ *   + DIRTY: the entry has been translated but needs to be updated.          *
+ *   + IGNORE: the entry does not need to be translated.                      *
+ * When a comment is not recognized, it is discarded.                         *
+ ******************************************************************************/
+
+return array(
+	'about' => array(
+		'_' => '關於',
+		'agpl3' => '<a href="https://www.gnu.org/licenses/agpl-3.0.html">AGPL 3</a>',	// IGNORE
+		'bug_reports' => array(
+			'environment_information' => array(
+				'_' => 'System information',	// TODO
+				'browser' => 'Browser',	// TODO
+				'database' => 'Database',	// TODO
+				'server_software' => 'Server software',	// TODO
+				'version_curl' => 'cURL version',	// TODO
+				'version_frss' => 'FreshRSS version',	// TODO
+				'version_php' => 'PHP version',	// TODO
+			),
+		),
+		'bugs_reports' => '報告錯誤',
+		'documentation' => 'Documentation',	// TODO
+		'freshrss_description' => 'FreshRSS 是一個自托管的 RSS 聚合服務。 它不僅輕快又易用，而且強大又易於配置。',
+		'github' => '<a href="https://github.com/FreshRSS/FreshRSS/issues">GitHub Issues</a>',
+		'license' => '授權',
+		'project_website' => '項目網站',
+		'title' => '關於',
+		'version' => '版本',
+	),
+	'feed' => array(
+		'empty' => '暫時沒有文章可顯示。',
+		'received' => array(
+			'before_yesterday' => 'Received before yesterday',	// TODO
+			'today' => 'Received today',	// TODO
+			'yesterday' => 'Received yesterday',	// TODO
+		),
+		'rss_of' => '%s 的訂閱源',
+		'title' => '首頁',
+		'title_fav' => '收藏',
+		'title_global' => '全局視圖',
+	),
+	'log' => array(
+		'_' => '日誌',
+		'clear' => '清除日誌',
+		'empty' => '日誌文件為空',
+		'title' => '日誌',
+	),
+	'menu' => array(
+		'about' => '關於 FreshRSS',
+		'before_one_day' => '一天前',
+		'before_one_week' => '一週前',
+		'bookmark_query' => '收藏當前查詢',
+		'favorites' => '收藏（%s）',
+		'global_view' => '全局視圖',
+		'important' => '重要的源',
+		'main_stream' => '首頁',
+		'mark_all_read' => '全部設為已讀',
+		'mark_cat_read' => '此分類設為已讀',
+		'mark_feed_read' => '此訂閱源設為已讀',
+		'mark_selection_unread' => '選中設為已讀',
+		'mylabels' => '我的標籤',
+		'newer_first' => '由新至舊',
+		'non-starred' => '顯示未收藏',
+		'normal_view' => '普通視圖',
+		'older_first' => '由舊至新',
+		'queries' => '自定義查詢',
+		'read' => '顯示已讀',
+		'reader_view' => '閱讀視圖',
+		'rss_view' => '訂閱源',
+		'search_short' => '搜尋',
+		'sort' => array(
+			'_' => 'Sorting criteria',	// TODO
+			'c' => array(
+				'name_asc' => 'Category, feed titles A→Z',	// TODO
+				'name_desc' => 'Category, feed titles Z→A',	// TODO
+			),
+			'date_asc' => 'Publication date 1→9',	// TODO
+			'date_desc' => 'Publication date 9→1',	// TODO
+			'f' => array(
+				'name_asc' => 'Feed title A→Z',	// TODO
+				'name_desc' => 'Feed title Z→A',	// TODO
+			),
+			'id_asc' => 'Freshly received last',	// TODO
+			'id_desc' => 'Freshly received first',	// TODO
+			'link_asc' => 'Link A→Z',	// TODO
+			'link_desc' => 'Link Z→A',	// TODO
+			'rand' => 'Random order',	// TODO
+			'title_asc' => 'Title A→Z',	// TODO
+			'title_desc' => 'Title Z→A',	// TODO
+		),
+		'starred' => '顯示收藏',
+		'stats' => '統計',
+		'subscription' => '訂閱管理',
+		'unread' => '顯示未讀',
+	),
+	'share' => '分享',
+	'tag' => array(
+		'related' => '文章標籤',
+	),
+	'tos' => array(
+		'title' => '服務條款',
+	),
+);