add (overwrite with) mypy stubs, if available

stdlib/3/locale.pyi

@@ -0,0 +1,17 @@
+# Stubs for locale (Python 3.4)
+#
+# NOTE: This stub is based on a stub automatically generated by stubgen.
+
+from _locale import *
+
+def format(percent, value, grouping=False, monetary=False, *additional): ...
+def format_string(f, val, grouping=False): ...
+def currency(val, symbol=True, grouping=False, international=False): ...
+def str(val): ...
+def atof(string, func=...): ...
+def atoi(str): ...
+def normalize(localename): ...
+def getdefaultlocale(envvars=...): ...
+def getlocale(category=...): ...
+def resetlocale(category=...): ...
+def getpreferredencoding(do_setlocale=True): ...