"Collectible Skins" updated: 1.4.0 - Di tutto un .po

Translations: use .po format instead of .tr (both for mod and world folder)

minetest. -> core.

Increased minimum required Luanti version: 5.4 -> 5.10

Translations

[+] Dutch (Gusted)

[+] Portuguese - BR (IamnotMinetest)

[+] Turkish (birdlover32767)

French (Monapp, milimarg, Notmey)

Italian

Polish (DoktorZieluch)

Russian (SkyBuilder1717)