Events and News Widget: Multi-day event placeholders are not replaced with dates in some languages

[Nao]

When the user profile language is set to Korean or Japanese, the multi-event WordCamp dates are not correctly displayed in the dashboard widget. This only reproducible only in a certain environment (see how to reproduce section below):

The placeholders are not replaced with numbers and the exact translation is shown, such as %4$d年%1$s月%2$d日〜%3$d日 (Japanese) and %4$d년 %1$s %2$d일–%3$d일 (Korean).

The strings in question: ​Japanese / ​Korean

How to reproduce:
If you have access to any WordCamp site's dashboard, go to Users > Profile and set your language to 日本語 (Under "Italiano"). Go to /wp-admin/ and check the Events and News widget.

Depending on the server the site is on, there are at least 3 variations: garbled date, correct translation, or incorrect word order (for all dates, not just multi-day events).

[Nao]

Example 1: WordCamp.org site - garbled date

[Nao]

Example 2: Self-hosted site - correct display

[Nao]

Example 3: ja.wordpress.org site - incorrect word order