Maintenance + translation support (#2)

* maintenance + translation support

* fix too long line warning

* improvements through code review

.luacheckrc

@@ -0,0 +1,11 @@
+unused_args = false
+
+read_globals = {
+    table = {fields = {"copy"}},
+    "minetest",
+    "digilines"
+}
+
+globals = {
+    "led_marquee"
+}