Localization support

Localization support. Finnish language added as a second language for the system. Also fixed an issue that could have shown direct error messages to the end users.

Needs testing before merge

tests/test_i18n.py

@@ -38,6 +38,7 @@ def test_for_supported_locales(app: Flask, babel: Babel):
     """
     with app.app_context():
         languages: List[Locale] = babel.list_translations()
+        print('Languages are: ', languages)
 
         # Using list comprehension to convert Enum to list of Locales
         # required_languages = [Locale.parse(locale.value) for locale in SupportedLocales]