Import translations and clean up

- Strip any gui._.config options. These haven't been used since 1.12
   and while they may return, it doesn't seem worth it right now.
 - Fix a couple of typos in the English translations.
 - Import from https://i18n.tweaked.cc. There's definitely some problems
   with the import - empty translations are still included, so we write
   a script to strip them.

tools/language.py

@@ -0,0 +1,42 @@
+"""
+Rewrites language files in order to be consistent with en_us.
+
+This will take every given language file and rewrite it to be in the same
+order as the en_us file. Any keys which appear in the given file, but not
+in en_us are removed.
+
+Note, this is not intended to be a fool-proof tool, rather a quick way to
+ensure language files are mostly correct.
+"""
+
+import pathlib, sys, json
+from collections import OrderedDict
+
+root = pathlib.Path("src/main/resources/assets/computercraft/lang")
+
+with (root / "en_us.json").open(encoding="utf-8") as file:
+    en_us = json.load(file, object_hook=OrderedDict)
+
+for path in root.glob("*.json"):
+    if path.name == "en_us.json":
+        continue
+
+    with path.open(encoding="utf-8") as file:
+        lang = json.load(file)
+
+    out = OrderedDict()
+    missing = 0
+    for k in en_us.keys():
+        if k not in lang:
+            missing += 1
+        elif lang[k] == "":
+            print("{} has empty translation for {}".format(path.name, k))
+        else:
+            out[k] = lang[k]
+
+    with path.open("w", encoding="utf-8", newline="\n") as file:
+        json.dump(out, file, indent=4, ensure_ascii=False)
+        file.write("\n")
+
+    if missing > 0:
+        print("{} has {} missing translations.".format(path.name, missing))