add: i18n msgid test

src/i18n/__init__.py

@@ -8,12 +8,15 @@ Usage:
 """
 
 import gettext
+import logging
 from pathlib import Path
 from typing import Optional
 
 # Cache for loaded translations.
 _translations: dict[str, Optional[gettext.GNUTranslations]] = {}
 
+logger = logging.getLogger(__name__)
+
 
 def _get_locale_dir() -> Path:
     """Get the locales directory path."""
@@ -99,6 +102,10 @@ def t(message: str, **kwargs) -> str:
     else:
         translated = message
     
+    # Check for missing translation if not in English
+    if _get_current_lang() != "en-US" and translated == message and message.strip():
+        logger.warning(f"[i18n] Missing translation for msgid: '{message}'")
+    
     if kwargs:
         try:
             return translated.format(**kwargs)

tests/test_i18n_lint.py

@@ -0,0 +1,36 @@
+import re
+import pytest
+from pathlib import Path
+
+# Define Chinese character range
+ZH_PATTERN = re.compile(r'[\u4e00-\u9fff]')
+# Match msgid "content"
+MSGID_PATTERN = re.compile(r'^msgid\s+"(.*)"')
+
+def get_po_files():
+    """Get all .po files in src/i18n/locales"""
+    root_dir = Path(__file__).parent.parent / "src" / "i18n" / "locales"
+    return list(root_dir.rglob("*.po"))
+
+@pytest.mark.parametrize("po_file", get_po_files())
+def test_msgid_should_not_contain_chinese(po_file):
+    """
+    Ensure msgid in .po files does not contain Chinese characters.
+    Convention: msgid should be English source text, msgstr is the translation.
+    """
+    errors = []
+    
+    try:
+        with open(po_file, 'r', encoding='utf-8') as f:
+            for line_num, line in enumerate(f, 1):
+                line = line.strip()
+                match = MSGID_PATTERN.match(line)
+                if match:
+                    content = match.group(1)
+                    if ZH_PATTERN.search(content):
+                        errors.append(f"Line {line_num}: {content}")
+    except FileNotFoundError:
+        pytest.skip(f"File not found: {po_file}")
+    
+    error_msg = "\n".join(errors)
+    assert not errors, f"Found Chinese characters in msgid in {po_file}:\n{error_msg}"