feat: Introduce translate module for Google Translate integration and location-based language detection, and add a new filter module.

engine/translate.py

@@ -0,0 +1,41 @@
+"""
+Google Translate wrapper and location→language detection.
+Depends on: sources (for LOCATION_LANGS).
+"""
+
+import re
+import json
+import urllib.request
+import urllib.parse
+
+from engine.sources import LOCATION_LANGS
+
+_TRANSLATE_CACHE = {}
+
+
+def detect_location_language(title):
+    """Detect if headline mentions a location, return target language."""
+    title_lower = title.lower()
+    for pattern, lang in LOCATION_LANGS.items():
+        if re.search(pattern, title_lower):
+            return lang
+    return None
+
+
+def translate_headline(title, target_lang):
+    """Translate headline via Google Translate API (zero dependencies)."""
+    key = (title, target_lang)
+    if key in _TRANSLATE_CACHE:
+        return _TRANSLATE_CACHE[key]
+    try:
+        q = urllib.parse.quote(title)
+        url = ("https://translate.googleapis.com/translate_a/single"
+               f"?client=gtx&sl=en&tl={target_lang}&dt=t&q={q}")
+        req = urllib.request.Request(url, headers={"User-Agent": "mainline/0.1"})
+        resp = urllib.request.urlopen(req, timeout=5)
+        data = json.loads(resp.read())
+        result = "".join(p[0] for p in data[0] if p[0]) or title
+    except Exception:
+        result = title
+    _TRANSLATE_CACHE[key] = result
+    return result