♿️ fix: improve accessibility and i18n (#183)

i18n/zh-Hans.toml

@@ -19,6 +19,10 @@ next = "下一页"  # As in "Next" page.
 of = "/"  # E.g. Page 1 "of" 3
 all_posts = "所有文章"
 all_tags = "所有标签"
+language_selection = "语言选择"  # Machine translated.
+toggle_mode = "切换到$MODE模式"  # $MODE will be replaced by a value (or both) below. Machine translated.
+dark = "暗"  # Machine translated. 
+light = "亮"  # Machine translated.
 
 # Post metadata.
 draft = "草稿"
@@ -31,6 +35,10 @@ see_changes = "修改纪录"
 table_of_contents = "目录"
 load_comments = "载入留言"
 
+# Copy code block button.
+copied = "已复制!"  # Machine translated.
+copy_code_to_clipboard = "复制代码到剪贴板"  # Machine translated.
+
 # Footer: Powered by Zola and tabi.
 powered_by = "网站基于"
 and = "和"