fix translations

[steve02081504]

add more keys for #2567 (comment)
and some fixes

[Gerrit0]

GitHub didn't pick it up as I rebased, but this was merged with 3eb73cb, thanks!

I made a couple changes after merging:

1. theme_member_protected etc. are from the ReflectionFlag enum, which now has a dedicated section, which highlighted some additional missing values
2. tag_alias is not in TypeDoc's default list of valid tags, so should not have a translation in the default translation objects. If you use it in your project, you can add translations for it using the locales object in your typedoc config:

{
  "locales": {
    "zh": {
      "tag_alias": "別名"
    }
  }
}

(@alias is not supported by TypeDoc, in that TypeDoc does not support renaming exports arbitrarily, as specified by JSDoc, so I don't want to add it to the config)