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This leverages 4-bytes of padding in FDisplayStringEntry to store an ID (an int32 index generated via FTextLocalizationManager::GetLocalizationTargetPathId) that is used to tag each display string with the localization target that it belongs to, without increasing the size of DisplayStringLookupTable. There is an additional LUT mapping each localization target ID to its text IDs to act as an accelerator for HandleLocalizationTargetsUnmounted, however this LUT only tracks text IDs associated with localization data loaded via HandleLocalizationTargetsMounted to minimize the memory impact of this additional tracking. Without this LUT HandleLocalizationTargetsUnmounted would need to spin the entire live table each time, which is not acceptable from a performance standpoint. Now that HandleLocalizationTargetsUnmounted is implemented it's also been hooked into GFP deactivation, to mirror how HandleLocalizationTargetsMounted was hooked into GFP activation. #rb anton.dunchev [CL 32499628 by jamie dale in 5.4 branch]