LoadFromArchive

// Read key
FString Key;
Archive << Key;

FEntryArray& EntryArray = KeyTable.FindOrAdd(*Key);

FEntry NewEntry;
NewEntry.LocResID = LocalizationResourceIdentifier;

// Read string entry.
Archive << NewEntry.SourceStringHash;

if (VersionNumber >= FTextLocalizationResourceVersion::ELocResVersion::Compact)
{
    int32 LocalizedStringIndex = INDEX_NONE;
    Archive << LocalizedStringIndex;

    if (LocalizedStringArray.IsValidIndex(LocalizedStringIndex))
    {
        NewEntry.LocalizedString = LocalizedStringArray[LocalizedStringIndex];
    }
    else
    {
        UE_LOG(LogTextLocalizationResource, Warning, TEXT("LocRes '%s' has an invalid localized string index for namespace '%s' and key '%s'. This entry will have no translation."), *LocalizationResourceIdentifier, *Namespace, *Key);
    }
}
else
{
    Archive << NewEntry.LocalizedString;
}

EntryArray.Add(NewEntry);