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I set the name in the enchant creating code :

		this.setName("alb_"+name); // with name = "studying"
		this.setRegistryName(new ResourceLocation(AlbinosEnchants.MODID,"alb_"+name)); // AlbinosEnchants.MODID = "albinosenchants"


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Various tries in the en_us.lang file located in src/main/resources/assets/lang :

enchantment.albinomc.albinosenchants:alb_studying=Studying A
enchantment.albinomc.albinosenchants.alb_studying=Studying B

enchantment.albinosenchants:alb_studying=Studying C
enchantment.albinosenchants.alb_studying=Studying D

enchantment.albinosenchants:alb_studying=Studying E
enchantment.albinosenchants.alb_studying=Studying F


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pack.mcmeta in src.main/resources (mod custom icon works) :


{
    "pack": {
        "description": "albinosenchants resources",
        "pack_format": 3,
        "_comment": "Yay, a comment !"
    }
}