Some Quest games ship voice-over languages as <tag>.lang files and ask the Meta Platform SDK for them; overport's
platform loader answers with nothing, so every language but the built-in one stays greyed out. libfp_langpack.so
answers the language-pack and asset-file calls from the packs already on the device (Metadata = the game's
versionName, the /storage/emulated/0 path spelling Unreal uses). Tested in the headset with Deadpool VR (German
dialogue), AC Nexus and Asgard's Wrath 2.