Show the user roles as real names (#867)

* Show the user roles as real names

* Add error message

* Update Role.java

* default Language without translation

* Update messages_el_GR.properties

src/main/resources/messages_zh_CN.properties

@@ -53,6 +53,8 @@ notAuthenticatedMessage=用户未经过身份验证。
 userNotFoundMessage=未找到用户。
 incorrectPasswordMessage=当前密码不正确。
 usernameExistsMessage=新用户名已存在。
+deleteCurrentUserMessage=Cannot delete currently logged in user.
+deleteUsernameExistsMessage=The username does not exist and cannot be deleted.
 
 
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@@ -147,8 +149,10 @@ adminUserSettings.roles=角色
 adminUserSettings.role=角色
 adminUserSettings.actions=操作
 adminUserSettings.apiUser=有限 API 用户
+adminUserSettings.extraApiUser=Additional Limited API User
 adminUserSettings.webOnlyUser=仅限 Web 用户
 adminUserSettings.demoUser=Demo User (No custom settings)
+adminUserSettings.internalApiUser=Internal API User
 adminUserSettings.forceChange=强制用户在登录时更改用户名/密码
 adminUserSettings.submit=保存用户