Add luacheck, update translations, replace ABMs, bug fixes (#1)

* luacheck, mt 5 translation, german translation, maintenance

* fix luacheck warnings

* Fix digital clock nodebox and texture

* Fix luacheck usage

* Add comment why fonts are not split into several lines

font_api/fallbacks.lua

@@ -53,7 +53,7 @@ return {
 	['×'] = 'x',	['Ý'] = 'Y',
 
 	-- Lower case accents
-	['à'] = 'a',	['à'] = 'a',	['á'] = 'a',	['â'] = 'a',
+	['à'] = 'a',	['á'] = 'a',	['â'] = 'a',
 	['ã'] = 'a',	['ä'] = 'a',	['å'] = 'a',
 	['æ'] = 'ae',	['ç'] = 'c',
 	['è'] = 'e',	['é'] = 'e',	['ê'] = 'e',	['ë'] = 'e',