I ran into the same thing. Here is an updated version of Game.ini that worked for me:
;Common settings to be used for all commandlets as needed.
[CommonSettings]
SourcePath=./Content/Localization/Game
DestinationPath=./Content/Localization/Game
ManifestName=Game.manifest
ArchiveName=Game.archive
ResourceName=Game.locres
PortableObjectName=Game.po
;English
NativeCulture=en
;English
CulturesToGenerate=en
;French - Commented Out
;CulturesToGenerate=fr
;Italian - Commented Out
;CulturesToGenerate=it
;German - Commented Out
;CulturesToGenerate=de
;Spanish - Commented Out
;CulturesToGenerate=es
;Gather text from source code and configuration files.
[GatherTextStep0]
CommandletClass=GatherTextFromSource
SearchDirectoryPaths=./Source/
SearchDirectoryPaths=./Config/
ExcludePathFilters=*/Config/Localization/*
FileNameFilters=*.h
FileNameFilters=*.cpp
FileNameFilters=*.ini
;Gather text from assets in content.
[GatherTextStep1]
CommandletClass=GatherTextFromAssets
IncludePathFilters=./Content/*
ExcludePathFilters=*/Content/Localization/*
PackageFileNameFilters=*.umap
PackageFileNameFilters=*.uasset
;Create manifest with all gathered source text.
[GatherTextStep2]
CommandletClass=GenerateGatherManifest
;Create new archives/update existing archives with new entries from the manifest.
[GatherTextStep3]
CommandletClass=GenerateGatherArchive
;Import new translations from PO (portable object) files into existing archives.
[GatherTextStep4]
CommandletClass=InternationalizationExport
bImportLoc=true
;Export new source from existing archives into PO (portable object) files.
[GatherTextStep5]
CommandletClass=InternationalizationExport
bExportLoc=true
;Compile source text and translations into binary form for use by the application.
[GatherTextStep6]
CommandletClass=GenerateTextLocalizationResource