Add brazilian portuguese translation for butterflies (#3085)

mods/butterflies/locale/butterflies.pt_BR.tr

@@ -1,4 +1,4 @@
 # textdomain: butterflies
-White Butterfly=
-Red Butterfly=
-Violet Butterfly=
+White Butterfly=Borboleta Branca
+Red Butterfly=Borboleta Vermelha
+Violet Butterfly=Borboleta Violeta