I18n: Completed i18n&&proofread some translations (#2619)
* i18n-1 * i18n: Completed the remaining parts of i18n and proofread some translations * i18n: add default lang&&add app template i18n
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* i18n-1 * i18n: Completed the remaining parts of i18n and proofread some translations * i18n: add default lang&&add app template i18n