♿️ fix: improve accessibility and i18n (#183)

i18n/ru.toml

@@ -19,6 +19,10 @@ next = "След."  # As in "Next" page.
 of = "из"  # E.g. Page 1 "of" 3
 all_posts = "Все посты"
 all_tags = "Все теги"
+language_selection = "Выбор языка"
+toggle_mode = "Переключить на режим $MODE"  # $MODE will be replaced by a value (or both) below.
+dark = "тёмный"
+light = "светлый"
 
 # Post metadata.
 draft = "ЧЕРНОВИК"
@@ -31,6 +35,10 @@ see_changes = "Смотреть изменения"
 table_of_contents = "Содержание"
 load_comments = "Загрузить комментарии"
 
+# Copy code block button.
+copied = "Скопировано!"
+copy_code_to_clipboard = "Скопировать код в буфер обмена"
+
 # Footer: Powered by Zola and tabi.
 powered_by = "Под управлением"
 and = "&"