fix - change ":" by "." in utf8 lower

init.lua

@@ -28,6 +28,7 @@
 local S = minetest.get_translator("filter")
 
 filter = { registered_on_violations = {} }
+local utf8 = require 'lua-utf8'
 local words = {}
 local muted = {}
 local violations = {}
@@ -65,7 +66,7 @@ end
 
 function filter.check_message(name, message)
 	for _, w in ipairs(words) do
-		if string.find(message:lower(), "%f[%a]" .. w .. "%f[%A]") then
+		if utf8.find(utf8.lower(message), "%f[%a]" .. w .. "%f[%A]") then
 			return false
 		end
 	end
@@ -207,7 +208,7 @@ minetest.after(10*60, step)
 minetest.register_chatcommand("filter", {
 	params = S("filter server"),
 	description = S("manage swear word filter"),
-	privs = {server = true},
+	privs = {mute = true},
 	func = function(name, param)
 		local cmd, val = param:match("(%w+) (.+)")
 		if param == "list" then