Hi!
I don’t know if it’s the right place to give an answer, but I hope it will help somebody 
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I had a crash when I tried to open the project with the same log: “Failed to open ICUInternationalization data file, missing or corrupt?”.
It was on macOS with 5.4 and 5.5. I checked the code around line 162 of ICUInternationalization.cpp (on 5.5) and from what I understood, it tries to check if there are any Internationalization content in the Project we’re trying to open (Content/Internationalization) + in the Engine.
My solution
I had an empty Internationalization folder in my project. By removing it, the project could launch without any crash.