general overhaul for 5.0.0 (#11)

* general overhaul for 5.0.0

- overhauled English language
- overhauled French language
- adds Spanish locale
- adds German locale
- adds mtt integration testing
- adds github workflow for mtt
- refactores handle_command
- standardizes usage of table.getn() (nothing crucial in this mod)
- standardizes variables to have same format and same name for same
purpouse
- DB-fix also adds missing owners to members
- fixes some situations where admins couldn't do things
- fixes display of dynamic admin priv and registration
- alows uppercase for subcommands
- adds valid_password() for cleaner checks
- ensures that existing factions don't get overwritten

* provide alternative to table.pack()

* add disband hooks support

* remove local f == factions

.luacheckrc

@@ -4,5 +4,7 @@ globals = {
 
 read_globals = {
 	"minetest",
-	"table"
+	"dump", "dump2",
+	"table",
+	"mtt",
 }