Exclude wagtail/utils/l18n from linting

setup.cfg

@@ -3,13 +3,14 @@ python-tag = py3
 
 [flake8]
 ignore = E501,E303
-exclude = wagtail/project_template/*
+exclude = wagtail/project_template/*,wagtail/utils/l18n/*
 max-line-length = 120
 
 [isort]
 line_length=100
 multi_line_output=4
 skip=migrations,project_template
+skip_glob=*/wagtail/utils/l18n/*
 known_first_party=wagtail
 known_third_party=willow,modelcluster,taggit,django,unidecode,bs4,pytz,PIL