Add a server-sided way to remove color codes from incoming chat messages (#5948)

These code be generated by CSM, a modded client or just copy and pasted by the player.

Changes
- Update configuration example and setting translation file.
- Remove colour codes before logging chat.
- Add setting to remove colour codes before processing the chat.

minetest.conf.example

@@ -344,8 +344,8 @@
 # serverlist_file = favoriteservers.txt
 
 #    Maximum size of the out chat queue. 0 to disable queueing and -1 to make the queue size unlimited
-#    type: int min: -1
-max_out_chat_queue_size = 20
+#    type: int
+# max_out_chat_queue_size = 20
 
 ## Graphics
 
@@ -555,7 +555,7 @@ max_out_chat_queue_size = 20
 #    type: int
 # screenH = 600
 
-#    Save the window size automatically when modified.
+#    Save window size automatically when modified.
 #    type: bool
 # autosave_screensize = true
 
@@ -867,11 +867,10 @@ max_out_chat_queue_size = 20
 #    type: string
 # serverlist_url = servers.minetest.net
 
-#    Disable escape sequences, e.g. chat coloring.
-#    Use this if you want to run a server with pre-0.4.14 clients and you want to disable
-#    the escape sequences generated by mods.
+#    Remove color codes from incoming chat messages
+#    Use this to stop players from being able to use color in their messages
 #    type: bool
-# disable_escape_sequences = false
+# strip_color_codes = false
 
 ## Network
 
@@ -1841,3 +1840,4 @@ max_out_chat_queue_size = 20
 #    Print the engine's profiling data in regular intervals (in seconds). 0 = disable. Useful for developers.
 #    type: int
 # profiler_print_interval = 0
+