diff --git a/scripts/localize.py b/scripts/localize.py
new file mode 100755
index 0000000..f8ded38
--- /dev/null
+++ b/scripts/localize.py
@@ -0,0 +1,221 @@
+#!/usr/bin/env python3
+"""
+localize.py — small helper for managing lib/localizations/*.json translation files.
+
+Usage (normally invoked via scripts/localize.sh):
+
+  localize.sh --check
+      Validate that every locale file is valid JSON, has a language.name key,
+      and has exactly the same set of leaf keys as en.json (the reference).
+      Exits non-zero (and prints details) if anything doesn't match.
+
+  localize.sh --list [--lang xx]
+      Print all dot-notation leaf keys. Defaults to en.json if --lang is
+      omitted. Useful for seeing the full key structure at a glance.
+
+  localize.sh --get --lang xx --key some.nested.key
+      Print the value of a single key from lib/localizations/xx.json.
+
+  localize.sh --write --lang xx --key some.nested.key "New value"
+      Set (or add) the value of a key in lib/localizations/xx.json. Creates
+      intermediate objects as needed. Preserves key order/formatting via
+      Python's json module (2-space indent, matching existing files).
+
+Examples:
+  ./scripts/localize.sh --check
+  ./scripts/localize.sh --list --lang de
+  ./scripts/localize.sh --get --lang en --key node.title
+  ./scripts/localize.sh --write --lang es --key node.checkingNodeStatusTitle "Comprobando estado"
+"""
+
+import argparse
+import json
+import sys
+from pathlib import Path
+
+LOCALIZATIONS_DIR = Path(__file__).resolve().parent.parent / "lib" / "localizations"
+REFERENCE_LOCALE = "en"
+
+
+def locale_path(lang: str) -> Path:
+    return LOCALIZATIONS_DIR / f"{lang}.json"
+
+
+def load_locale(lang: str) -> dict:
+    path = locale_path(lang)
+    if not path.exists():
+        print(f"error: no such locale file: {path}", file=sys.stderr)
+        sys.exit(1)
+    try:
+        with open(path, "r", encoding="utf-8") as f:
+            return json.load(f)
+    except json.JSONDecodeError as e:
+        print(f"error: {path.name} is not valid JSON: {e}", file=sys.stderr)
+        sys.exit(1)
+
+
+def save_locale(lang: str, data: dict) -> None:
+    path = locale_path(lang)
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(data, f, ensure_ascii=False, indent=2)
+        f.write("\n")
+
+
+def all_locale_files():
+    return sorted(LOCALIZATIONS_DIR.glob("*.json"))
+
+
+def extract_leaf_keys(data, prefix=""):
+    keys = set()
+    for k, v in data.items():
+        full_key = f"{prefix}.{k}" if prefix else k
+        if isinstance(v, dict):
+            keys |= extract_leaf_keys(v, full_key)
+        else:
+            keys.add(full_key)
+    return keys
+
+
+def get_nested(data: dict, dotted_key: str):
+    parts = dotted_key.split(".")
+    node = data
+    for part in parts:
+        if not isinstance(node, dict) or part not in node:
+            return None
+        node = node[part]
+    return node
+
+
+def set_nested(data: dict, dotted_key: str, value: str) -> None:
+    parts = dotted_key.split(".")
+    node = data
+    for part in parts[:-1]:
+        if part not in node or not isinstance(node[part], dict):
+            node[part] = {}
+        node = node[part]
+    node[parts[-1]] = value
+
+
+def cmd_check(_args) -> int:
+    files = all_locale_files()
+    if not files:
+        print(f"error: no locale files found in {LOCALIZATIONS_DIR}", file=sys.stderr)
+        return 1
+
+    ref_path = locale_path(REFERENCE_LOCALE)
+    if not ref_path.exists():
+        print(f"error: reference locale '{REFERENCE_LOCALE}.json' not found", file=sys.stderr)
+        return 1
+
+    ok = True
+
+    parsed = {}
+    for path in files:
+        try:
+            with open(path, "r", encoding="utf-8") as f:
+                parsed[path.stem] = json.load(f)
+        except json.JSONDecodeError as e:
+            print(f"FAIL  {path.name}: invalid JSON: {e}")
+            ok = False
+
+    for lang, data in parsed.items():
+        lang_name = data.get("language", {}).get("name")
+        if not isinstance(lang_name, str) or not lang_name:
+            print(f"FAIL  {lang}.json: missing 'language.name' string")
+            ok = False
+
+    if REFERENCE_LOCALE not in parsed:
+        print(f"error: {REFERENCE_LOCALE}.json failed to parse, cannot compare keys")
+        return 1
+
+    reference_keys = extract_leaf_keys(parsed[REFERENCE_LOCALE])
+
+    for lang, data in parsed.items():
+        if lang == REFERENCE_LOCALE:
+            continue
+        keys = extract_leaf_keys(data)
+        missing = reference_keys - keys
+        extra = keys - reference_keys
+        if missing:
+            print(f"FAIL  {lang}.json: missing {len(missing)} key(s):")
+            for k in sorted(missing):
+                print(f"        - {k}")
+            ok = False
+        if extra:
+            print(f"FAIL  {lang}.json: has {len(extra)} extra key(s) not in {REFERENCE_LOCALE}.json:")
+            for k in sorted(extra):
+                print(f"        + {k}")
+            ok = False
+
+    if ok:
+        print(f"OK    {len(parsed)} locale file(s) valid, all keys match {REFERENCE_LOCALE}.json")
+        return 0
+    return 1
+
+
+def cmd_list(args) -> int:
+    lang = args.lang or REFERENCE_LOCALE
+    data = load_locale(lang)
+    keys = sorted(extract_leaf_keys(data))
+    for k in keys:
+        print(k)
+    return 0
+
+
+def cmd_get(args) -> int:
+    if not args.lang or not args.key:
+        print("error: --get requires --lang and --key", file=sys.stderr)
+        return 1
+    data = load_locale(args.lang)
+    value = get_nested(data, args.key)
+    if value is None:
+        print(f"error: key '{args.key}' not found in {args.lang}.json", file=sys.stderr)
+        return 1
+    if isinstance(value, dict):
+        print(f"error: '{args.key}' is not a leaf key (it's an object) in {args.lang}.json", file=sys.stderr)
+        return 1
+    print(value)
+    return 0
+
+
+def cmd_write(args) -> int:
+    if not args.lang or not args.key or args.value is None:
+        print("error: --write requires --lang, --key, and a value argument", file=sys.stderr)
+        return 1
+    data = load_locale(args.lang)
+    set_nested(data, args.key, args.value)
+    save_locale(args.lang, data)
+    print(f"Wrote {args.lang}.json: {args.key} = {args.value!r}")
+    return 0
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Manage DeFlock localization JSON files.",
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        epilog=__doc__,
+    )
+    group = parser.add_mutually_exclusive_group(required=True)
+    group.add_argument("--check", action="store_true", help="Validate all locale files match en.json's key structure")
+    group.add_argument("--list", action="store_true", help="List all dot-notation leaf keys for a locale (default: en)")
+    group.add_argument("--get", action="store_true", help="Print the value of a single key")
+    group.add_argument("--write", action="store_true", help="Set the value of a single key")
+
+    parser.add_argument("--lang", help="Language code, e.g. 'en', 'de', 'es' (filename without .json)")
+    parser.add_argument("--key", help="Dot-notation key, e.g. 'node.title'")
+    parser.add_argument("value", nargs="?", help="New value (only used with --write)")
+
+    args = parser.parse_args()
+
+    if args.check:
+        sys.exit(cmd_check(args))
+    elif args.list:
+        sys.exit(cmd_list(args))
+    elif args.get:
+        sys.exit(cmd_get(args))
+    elif args.write:
+        sys.exit(cmd_write(args))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/localize.sh b/scripts/localize.sh
new file mode 100755
index 0000000..82405d2
--- /dev/null
+++ b/scripts/localize.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# Thin wrapper around localize.py — see that file's docstring for full usage.
+#
+# Examples:
+#   ./scripts/localize.sh --check
+#   ./scripts/localize.sh --list --lang de
+#   ./scripts/localize.sh --get --lang en --key node.title
+#   ./scripts/localize.sh --write --lang es --key node.checkingNodeStatusTitle "Comprobando estado"
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+PYTHON_BIN="${PYTHON_BIN:-python3}"
+
+exec "$PYTHON_BIN" "$SCRIPT_DIR/localize.py" "$@"