Locale additions for 3.6.0

[carsakiller]

• Adds completion for ---@package, ---@private, ---@protected.
• Adds descriptions for ---@package, ---@private, ---@protected.
• Updates the description for ---@field so that the new access modifiers are described.
• Adds temporary descriptions for other locales.

[carsakiller]

@AlexCai2019, would you be able to update the description for LUADOC_DESC_FIELD to include info about the new access modifiers for the zh-tw locale?

Here is the English version:
https://github.com/sumneko/lua-language-server/blob/bce48e44fefc1461698bddccca5fe4780465a695/locale/en-us/script.lua#L790-L797