When using the editor in Japanese, the warning/error summary for "Cook Content for Windows" gets garbled. This makes debugging cook related issues difficult.
1. (Use attached project that would generate cook warning/error to repro this easily)
2. Set the editor language to Japanese
3.  File > Cook Content for Windows
4.  Check the output log to see Warning/Error Summary (Unique only) contents are not displayed correctly(Japanese error messages are turned into "????")
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-47746 in the post.
| 0 | 
| Component | UE - Foundation - Core - Cooker | 
|---|---|
| Affects Versions | 4.16 | 
| Target Fix | 4.18 | 
| Created | Jul 27, 2017 | 
|---|---|
| Resolved | Aug 2, 2017 | 
| Updated | Apr 27, 2018 |