Localization is unintentionally changing UE default language to pt-BR when in viewport. This results in having to Stop, repeat steps, and select en to reset language to en. It does not change language in Standalone.
This was tested and reported in 4.24.3 (CL-11590370). This was reproduced in 4.25.3 (CL-13942748) and 4.26 Preview 3 (CL-14488950)
Outcome: By selecting either English or Portuguese, the Engines default language changes to respected language.
Expected Outcome: The default language should not change, it should only change in Viewport and Standalone
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-101256 in the post.