Fix typo in character.skin.file message

Corrected a grammatical error in the message to improve readability. The change adds clarity by ensuring the message reads as intended.

src/main/resources/messages.properties

@@ -12,7 +12,7 @@ character.name.too-long=<red><prefix> Name cannot be longer than 16 characters</
 character.not_found=<red><prefix> A character named <dark_red><name></dark_red> does not exist</red>
 character.not_player=<red><prefix> You have to provide a <dark_red>player</dark_red> character</red>
 character.pose=<gray><prefix> Changed pose of <green><character></green> to <green><pose></green></gray>
-character.skin.file=<red><prefix> The given has to be of type <dark_red>png</dark_red></red>
+character.skin.file=<red><prefix> The given file has to be of type <dark_red>png</dark_red></red>
 character.skin.generating=<gray><prefix> Generating new skin. This may take a while</gray>
 character.skin.image=<red><prefix> Failed to find a skin at the given location</red>
 character.skin.not_found=<red><prefix> The player <dark_red><player></dark_red> has no skin</red>