The language setting is not applied to the holiday calendars
My outlook is in Traditional Chinese except for the holiday calendars.
I recently re-merge the outlook app and found out the "Hong Kong Holiday" is in simplified Chinese, which is not a language used in Hong Kong. Further more, If I subscript to holiday calendar of another country, it is also shown in simplified calendar.
It may seem fine if French (Canada) be replaced with French (France), but think of Greek, Arabic or Mongolian language, but in Latin alphabets. As a Hong Konger, I would personally be ok with Chinese (Taiwan) as it is also in Traditional Chinese script, but for simplified Chinese, I would rather switch to English, because these are the two official languages in Hong Kong.
Another suggestion, I think it would be great if user can choose the local language for holiday calendar of other countries. For example, if I subscript to "Japan Holiday" in Japanese, when I see an event in Japanese I immediately know that it is a holiday in Japan.