support Multi-language step1

[0xblock]

Let the app support multiple languages, for which this feature is split into multiple milestone:

• import i18n and create en local file (this commit job).
• move error message to local file.
• add switch language button.
• copy lang file and wait translate.

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[0xmu]

Interesting

[0xblock]

@0xmu can you check and merge it?