diff --git a/scripts/check_langs_in_po.py b/scripts/check_langs_in_po.py
new file mode 100644
index 0000000000..eb2dc4ea7a
--- /dev/null
+++ b/scripts/check_langs_in_po.py
@@ -0,0 +1,176 @@
+#!/usr/bin/env python3
+"""
+Check PO files for translations from another language
+"""
+
+import argparse
+import re
+from pathlib import Path
+
+import polib
+from iso639 import Lang
+from pyfranc import franc
+
+
+# $ ls -1 | grep -Poh '([a-z]{3}|[a-z]{2})' | grep -Ev '(pot|en)' | sort -u | tr '\n' ' '
+# TODO: de-hardcode this.
+# Languages currently available in transifex-automations, without region
+ALLOWED_LANGUAGES = [
+    "ans",
+    "ar",
+    "az",
+    "bn",
+    "ca",
+    "cmn",
+    "cs",
+    "da",
+    "de",
+    "el",
+    "es",
+    "fa",
+    "fi",
+    "hi",
+    "hu",
+    "id",
+    "it",
+    "ja",
+    "ka",
+    "ko",
+    "ky",
+    "lt",
+    "mr",
+    "nb",
+    "ne",
+    "nl",
+    "pl",
+    "ps",
+    "pt",
+    "ru",
+    "si",
+    "sq",
+    "sv",
+    "tr",
+    "uk",
+    "ur",
+    "vi",
+    "zh",
+]
+
+LANGUAGE_PATTERN = r"([a-z]{3}|[a-z]{2})"
+
+
+def get_lang_from_file(po: polib.POFile) -> str | None:
+    """
+    Extract language from metadata['Language'], match the language pattern,
+    and return ISO 639-3 equivalent.
+    Returns None if language metadata is missing or invalid.
+    """
+    lang = po.metadata.get("Language", "")
+    match = re.match(LANGUAGE_PATTERN, lang)
+    try:
+        lang_code_2 = match.group(0)
+        return Lang(lang_code_2).pt3  # ISO 639-3 code
+    except (AttributeError, KeyError):
+        return None
+
+
+def convert_language_list_to_iso639_3(allowed_languages: list) -> list:
+    """
+    Generate a ISO 639-3 list from the existing language list as downloaded
+    from Transifex. Handles lang names as "ru", "pt_BR", "cmn" and "es_419"
+    """
+    converted = sorted([
+        Lang(lang).pt3 if len(lang) == 2 else lang for lang in allowed_languages]
+    )
+    return converted
+
+
+def detect_language_from_text(text: str, allowed_languages: list) -> str | None:
+    """
+    Return the ISO 639-3 language code as detected by pyfranc's franc function,
+    or return None if matches nothing, if undefined or not a 100% match.
+    """
+    found = franc.lang_detect(text, whitelist=allowed_languages)
+    if found and not found[0][0] == "und":
+        return found[0][0]  # returns ISO 639-3
+    else:
+        return None
+
+
+def find_matches_in_po(
+    po_path: str, delete_matches: bool = False, allowed_languages: list = []
+):
+    """
+    Compare expected language from metadata with detected language from msgstr.
+    If different, record the entry. Optionally delete mismatched translations.
+    """
+    matches = []
+    po = polib.pofile(po_path)
+    expected_lang = get_lang_from_file(po)
+    modified = False
+
+    if not expected_lang:
+        return matches  # skip if no valid expected language
+
+    for entry in po:
+        # Skip if there is no translation at all
+        if not entry.msgstr.strip():
+            continue
+
+        detected_lang = detect_language_from_text(entry.msgstr, allowed_languages)
+
+        if detected_lang != expected_lang and detected_lang:
+            matches.append((po_path, entry.linenum, detected_lang, entry.msgstr))
+            if delete_matches:
+                entry.msgstr = ""
+                modified = True
+
+        if delete_matches and modified:
+            po.save()
+
+    return matches
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "paths", nargs="+", help="One or more PO files or directories to search"
+    )
+    parser.add_argument(
+        "--delete-matches",
+        action="store_true",
+        help="Delete msgstr of matched entries.",
+    )
+    parser.add_argument(
+        "--lang",
+        metavar="LANG",
+        help="Specific language (2- or 3-letter code) to compare translations against. "
+        "If not set, will check against all allowed languages.",
+    )
+
+    args = parser.parse_args()
+
+    if args.lang:
+        allowed_list = convert_language_list_to_iso639_3([args.lang])
+    else:
+        allowed_list = convert_language_list_to_iso639_3(ALLOWED_LANGUAGES)
+
+    paths = []
+    for arg in args.paths:
+        p = Path(arg)
+        if p.is_dir():
+            paths.extend(p.rglob("*.po"))
+        elif p.is_file():
+            paths.append(p)
+        else:
+            print(f"Warning: {p} not found.")
+
+    for path in paths:
+        for po_path, linenum, detected_lang, text in find_matches_in_po(
+            path, args.delete_matches, allowed_list
+        ):
+            print(f"{po_path}:{linenum}: [{detected_lang}] {text}")
+
+
+if __name__ == "__main__":
+    main()