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/src/web/__init__.py

@@ -7,6 +7,8 @@ Usage:
 from quart import Quart, Blueprint
 from quart_babel import Babel
 from utils import load_modules
+from .log_handler import LogHandler
+import logging
 
 web = Blueprint('web', __name__)
 
@@ -30,3 +32,8 @@ class Web:
             locale_selector=get_locale,
             timezone_selector=get_tz,
             default_translation_directories=translation_directories)
+
+        h = LogHandler()
+        logging.getLogger().addHandler(h)
+        for name in logging.root.manager.loggerDict:
+            logging.getLogger(name).addHandler(h)