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diff --git a/tests/test_i18n_rendering.py b/tests/test_i18n_rendering.py
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+"""Tests that page rendering respects the configured language consistently."""
+
+from __future__ import annotations
+
+import pytest
+from starlette.testclient import TestClient
+
+from ollama_web.app import create_app
+from ollama_web.config import settings
+from ollama_web.i18n import get_messages, t
+
+
+@pytest.fixture
+def reset_language():
+    """Reset language to the initial value after each test."""
+    original = settings.language
+    yield
+    settings.language = original
+    if hasattr(get_messages, "cache_clear"):
+        get_messages.cache_clear()
+
+
+def _render_index() -> str:
+    """Render index.html and return the HTML body."""
+    app = create_app()
+    with TestClient(app) as client:
+        response = client.post("/api/auth/login", json={"pin": settings.pin})
+        assert response.status_code == 200
+        response = client.get("/")
+        return response.text
+
+
+def test_english_language_consistency(reset_language):
+    """When settings.language='en', all UI text including MCP must be English."""
+    settings.language = "en"
+    html = _render_index()
+    # HTML-side labels
+    assert 'lang="en"' in html
+    assert "MCP Settings" in html
+    assert "MCP Server Settings" in html
+    assert "＋ Add server" in html
+    # Japanese labels must not appear anywhere
+    assert "MCP設定" not in html
+    assert "MCPサーバー設定" not in html
+    assert "＋ サーバー追加" not in html
+    assert "セッション" not in html
+    assert "モデル:" not in html
+
+
+def test_japanese_language_consistency(reset_language):
+    """When settings.language='ja', all UI text including MCP must be Japanese."""
+    settings.language = "ja"
+    html = _render_index()
+    # HTML-side labels
+    assert 'lang="ja"' in html
+    assert "MCP設定" in html
+    assert "MCPサーバー設定" in html
+    assert "＋ サーバー追加" in html
+    # English labels must not appear anywhere
+    assert "MCP Settings" not in html
+    assert "MCP Server Settings" not in html
+    assert "＋ Add server" not in html
+    assert "Sessions" not in html
+    assert "Model:" not in html
+
+
+def test_t_helper_respects_language_override():
+    """The t() helper must return the requested language string."""
+    assert t("common.send", lang="en") == "Send"
+    assert t("common.send", lang="ja") == "送信"
+    assert t("mcp.server_settings", lang="en") == "MCP Server Settings"
+    assert t("mcp.server_settings", lang="ja") == "MCPサーバー設定"