Bot: Update translation

lang/nl_NL.json

@@ -9,6 +9,7 @@
         "bad_url": "",
         "cache_refreshed": "",
         "change_ducking_volume": "",
+        "change_max_volume": "",
         "change_mode": "",
         "change_volume": "",
         "cleared": "",
@@ -16,6 +17,7 @@
         "cleared_tags_from_all": "",
         "command_disabled": "",
         "current_ducking_volume": "",
+        "current_max_volume": "",
         "current_mode": "",
         "current_volume": "Huidig volume: {volume}.",
         "database_dropped": "",
@@ -29,6 +31,7 @@
         "help": "",
         "invalid_index": "",
         "last_song_on_the_queue": "",
+        "max_volume": "",
         "multiple_file_added": "",
         "multiple_file_deleted": "",
         "multiple_file_found": "",