Allow non-english letters in nested keys

Author: mstniy

src/ParseObject.js

@@ -1037,7 +1037,7 @@ class ParseObject {
       return new ParseError(ParseError.OTHER_CAUSE, 'ACL must be a Parse ACL.');
     }
     for (const key in attrs) {
-      if (!/^[A-Za-z][0-9A-Za-z_.]*$/.test(key)) {
+      if (!/^[A-Za-z][0-9A-Za-z_]*(\.|$)/.test(key)) {
         return new ParseError(ParseError.INVALID_KEY_NAME);
       }
     }

src/__tests__/ParseObject-test.js

@@ -882,6 +882,12 @@ describe('ParseObject', () => {
       })
     ).toEqual(new ParseError(ParseError.INVALID_KEY_NAME));
 
+    expect(
+      o.validate({
+        'nested.key.ö': 12,
+      })
+    ).toEqual(false);
+
     expect(
       o.validate({
         noProblem: 'here',