its because its from an unrecognized developer because you have to pay to put your name on a program or something i think i dont remember how it works i know the dev has to pay in some way to remove that message. thats why indie games always have that warning
also figure it out yourself i dont even fully understand it becuz i used a tutorial but files have to be ".intlang" (please please please use .intlang you can use whatever but it look cool when it .intlang)