Fixed some mistakes in exampleSite top menu

[VincentTam]

Description

1. added back French UI string for "Home". The code blocks below shows that that was missing in the past.

   hugo-future-imperfect-slim/i18n/fr.toml

   Lines 16 to 17 in 35c1b58

   	[about]
   	other = "A Propos"

   hugo-future-imperfect-slim/exampleSite/config.toml

   Lines 151 to 154 in 35c1b58

   	[[Languages.fr.menu.main]]
   	name = "About"
   	identifier = "about"
   	url = "/about/"

2. added back a proper localized language name for both Chinese (Simplified) and Chinese (Traditional) so that it makes sense.

   hugo-future-imperfect-slim/exampleSite/config.toml

   Lines 273 to 281 in 35c1b58

   	[Languages.zh-CN]
   	LanguageCode = "zh-CN"
   	LanguageName = "中文"
   	weight = 7
   	[Languages.zh-TW]
   	LanguageCode = "zh-TW"
   	LanguageName = "中文"
   	weight = 8

Motivation and Context

To make the displayed text in the top menu bar and the language bar more sensible.

Screenshots (if appropriate):

The French version of my fork's exampleSite displays the Chinese lanuage names and the French translation of "About" ("A Propos") properly after I merged the branch for this PR to my source branch addGHCI for hosting exampleSite with GitHub Actions.

Checklist:

• I have updated the documentation, as applicable.
• I have updated the theme.toml, as applicable.

[VincentTam]

Ready for merge