Changing an Android app name to include the string "RTÉ" causes subsequent Testflight uploads to fail:

Uploading to testflight
File: /Users/admin/.jenkins/jobs/The Hit Android/workspace/android/TheHit2013/bin/TheHit2013-debug.apk
POST Request: testflight.TestflightUploader$UploadRequest@1aee419f[filePaths=**/debug.apk,dsymPath=,apiToken=******,teamToken=*******,notifyTeam=false,buildNotes=The Hit Android automatic build

No changes since last build
,file=/Users/admin/.jenkins/jobs/The Hit Android/workspace/android/TheHit2013/bin/TheHit2013-debug.apk,dsymFile=<null>,lists=tellybug,replace=false,proxyHost=<null>,proxyUser=<null>,proxyPass=********,proxyPort=0,debug=true]
Incorrect response code: 400
'ascii' codec can't decode byte 0xc3 in position 2: ordinal not in range(128)

Here's the character details - note the 0xc3 byte

É
LATIN CAPITAL LETTER E WITH ACUTE
Unicode: U+00C9, UTF-8: C3 89

Uploading the APK directly via the Testflight web UI works as expected.