S allius/issue397 (#405)

* add Dashboards log handler to all known loggers

* add list of last 3 warnings/errors to page

* add note list to page

* create LogHandler for the dashboard

- simple memory log handler which stores the last
  64 warnings/errors for the dashboard

* render warnings/errors as note list

* add page for warnings and errors

* fix double defined build target

* add well done message if no errors in the logs

* translate page titles

* more translations

* add Notes page and table for important messages

* add unit tests

app/tests/test_web_route.py

@@ -68,6 +68,13 @@ async def test_rel_page(client):
     assert response.mimetype == 'text/html'
     web.build_relative_urls = False
 
+@pytest.mark.asyncio
+async def test_notes(client):
+    """Test the notes page route."""
+    response = await client.get('/notes')
+    assert response.status_code == 200
+    assert response.mimetype == 'text/html'
+
 @pytest.mark.asyncio
 async def test_logging(client):
     """Test the logging page route."""
@@ -185,6 +192,15 @@ async def test_mqtt_fetch(client, create_inverter):
     assert response.status_code == 200
 
 
+@pytest.mark.asyncio
+async def test_notes_fetch(client, config_conn):
+    """Test the notes-fetch route."""
+    _ = create_inverter
+
+    response = await client.get('/notes-fetch')
+    assert response.status_code == 200
+
+
 @pytest.mark.asyncio
 async def test_file_fetch(client, config_conn):
     """Test the data-fetch route."""