In relase description of update 18w19a is mentioned that there have been added new fancy biom names. But I don't think so. When I open F3, I can see Biome: minecraft:<biome_name_in_code>, for example Biome: minecraft:beaches and it is not very fancy, I guess.
MC-129360
Biomes in F3 debug are not fancy
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The F3 menu is supposed to show the id, it’s for debugging after all (and not supposed to change depending on language).