lang: Refactored langtool, updated chinese translation (#1623)

- Better argument parsing
- Allow processing all language folders at the same time
- Allow an optional reference language when translating
- Save translations on KeyboardInterrupt
- Fixes a ooold input issues by importing readline
(https://github.com/kovidgoyal/kitty/issues/6560)
- Add untranslate mode to remove translations by a key regex

---------

Co-authored-by: Nik <werwolv98@gmail.com>

plugins/script_loader/romfs/lang/zh_CN.json

@@ -0,0 +1,10 @@
+{
+    "code": "zh_CN",
+    "country": "China",
+    "language": "Chinese (Simplified)",
+    "translations": {
+        "hex.script_loader.menu.loading": "加载中……",
+        "hex.script_loader.menu.no_scripts": "空空如也",
+        "hex.script_loader.menu.run_script": "运行脚本……"
+    }
+}