Added default Chinese translation

[nicolaasmatthijs]

Our application integrates with Etherpad and will set Etherpad's locale to be the same as the one set in our application. However, the name of the Chinese translation file is not predictable compared to the other ones. Therefore, I'm adding a default Chinese locale file to the list of available locales.

[JohnMcLear]

I'm not sure how this will interact with translatewiki cc @marcelklehr and @siebrand

[marcelklehr]

Could you specify "not predictable"? If something doesn't work as
expected that could simply be a bug.

[nicolaasmatthijs]

@marcelklehr : Our application uses the standard language_country locale format (e.g. en_GB, nl_NL, etc.). Based on the locale set by the user in our application, we automatically specify which languages Etherpad needs to be shown in. This is done by taking the first part of that locale code (e.g. en, nl, etc.). Unfortunately, Chinese is the only one for which that doesn't work, as zh doesn't exist.

[marcelklehr]

We have fallbacks, but only from say 'zh-hans' to 'zh', not the other
way around.. Might be worth adding that, though. I'm open to that.

What do you think? If there's a consensus I'll happily add this.

[nicolaasmatthijs]

+1. Being able to fall back from zh-hans to zh would be very useful.

[marcelklehr]

Actually, I meant it the other way around. xx-foo already falls back
to xx, if the former doesn't exist. I was proposing a fallback from
xx to xx-<mmh>*, if xx doesn't exist

(* yea well, to what exactly..)

[nicolaasmatthijs]

Sorry, that is what I meant as well. The logical one to fall back to would probably be zh-hans.

[marcelklehr]

So, for this redirect to work for all languages, we can either use the first available or the alphabetically first lang as a redirect or we can define default redirects for all languages. I like alphabetical order ;)

[nicolaasmatthijs]

The alphabetical approach sounds more straightforward

[marcelklehr]

ok, please test #2052