Dashboard i18n localization

[jasonjoo2010]

Issue Description

Whether we should make dashboard support language switching or just english version?

Thus we could engage more users oversea.

[sczyh30]

Supporting i18n is necessary (we need at least Chinese and English version). We're planning to refactor the dashboard and this might be supported in later version. Suggestions are welcomed :)

[joshlong]

Please support English, at a minimum. It would make it easier for others to find and embrace this powerful tool

[sczyh30]

@joshlong The English version of Sentinel dashboard has been available in https://github.com/alibaba/Sentinel/releases/. We've also updated the document of Sentinel dashboard to match the English version. And we also provide a demo for Spring Cloud Alibaba here: https://github.com/sczyh30/sentinel-spring-cloud-demo.

Hope these can be helpful :)

[tbdpmi]

支持中文的国际化优化在哪里领取呢

[sczyh30]

For legacy AngularJS 1.x we may leverage angular-translate. Contributions are welcomed!

[jasonjoo2010]

I suggest a proposal that we can use ".mo" files integrated with gettext to support i18n of page, js, java.

Actually springboot has its i18n support through ".properties" files but i don't like it because it's not that straight forward and it cost additional tags and keys' naming.

So how about integrating with gettext?