Add the language of Chinese (Hong Kong)

[Jenny-HT]

This pull request serves as providing a starting point for other contributors on Chinese (Hong Kong).

[Jenny-HT]

To resolve #245

[johnbaku]

@Jenny-HT great initiative.

Is there possibly one or two people out there who knows enough "Chinese (Hong Kong)" to review this PR? Would really appreciate it. Thanks.

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Also asked in a status update:
https://fetlife.com/users/1/statuses/25980464

[kumo-cloud-fetlife]

Hi! 852 BDSM would be delighted to give any help! Our group has already finished translation on Glossary page.

[Jenny-HT]

@johnbaku Thank you.

To speed up the review process, these are the entries I translated. They are a few but good to start with. :D

• language_name
• login_button
• signup_button
• stats_members

Reviewers, please comment, approve or deny. Thank you in advance.

[Jenny-HT]

• Add the missing translation keys.
• Add more Chinese (Hong Kong) translations.

[nielsenramon]

Closing as it's missing our new strings.