When adding comments in PR with Korean/Chinese/Japanese language, the "Comments cannot be empty" error is thrown

Issue Summary

When adding comments in PR with Korean/Chinese/Japanese language, the "Comments cannot be empty" error is thrown

Steps to Reproduce

1. Setup a PR request on Bitbucket.
2. Install a Korean(Or Chinese or Japanese) keyboard layout on your computer.
3. Navigate to a pull request and Click Add Comment and type a comment in Korean or Chinese or Japanese. Then click "Comment" button to save it and you will see "Comments cannot be empty" error is thrown.
4. Same is case when you edit and save an existing comment in Korean or Chinese or Japanese.

Expected Results

The comment typed should be saved.

Actual Results

The comment is not saved and "Comments cannot be empty" error is thrown.

Workaround

After typing the comment in Korean or Chinese or Japanese, press Right-Arrow or Enter key to release the Keyboard from language composition mode and then click Save or Comment button to successfully save the comment.