You need to check how it is in 1.23wmf6 on git.wikimedia.org
Well, I still don't understand what happened.
This link at line 678 retrieves the message named "recentchanges-legend-newpage." This message is defined in this link at line 1569 correctly. However, in wikipedia:th:Special:Recentchanges the recent version of "recentchanges-legend-newpage" still appears which is completely incorrect. It has been like this for almost one month.