* Retranslate the complete Japanese online edition from Chinese
* Fit Japanese homepage labels and localize heading permalinks
* Point Japanese contribution instructions to the Japanese preview
* Replace locale conditionals with multilingual UI tables
Synchronize the fixes from #1936, #1824, and #1961 across translated editions and normalize C# and Dart formatting. Move Java CI to Ubuntu 24.04 so its Java 11/17 checks can run.