i18n: add missing i18n translate for page domain_create (#799)

packages/hydrooj/locales/en.yaml

@@ -17,6 +17,7 @@ discussion_edit: Discussion Edit
 discussion_main: Discussion
 discussion_node: Discussion
 display_name: Display Name
+domain_create: Create Domain
 domain_dashboard: Dashboard
 domain_discussion: Discussion Nodes
 domain_edit: Edit Info

packages/hydrooj/locales/zh.yaml

@@ -264,6 +264,7 @@ Domain {0} is bulit-in and cannot be modified.: 域 {0} 为内置，不可修改
 Domain {0} not found.: 域 {0} 不存在。
 Domain ID cannot be changed once the domain is created.: 在创建后不能更改 ID。
 Domain ID: 域 ID
+domain_create: 创建域
 domain_dashboard: 管理域
 domain_discussion: 讨论节点
 domain_edit: 编辑域资料