Add Chinese localization (#471)

* add zh-CN.yml for chinese

* The files appear to use CRLF line endings instead of LF (Unix-style).

* Add the missing entries to the zh-CN.yml file and include the Simplified Chinese option.

* Fix grammatical errors

Signed-off-by: jiang123574 <jiang123574@163.com>

* Update languages_helper.rb

Signed-off-by: jiang123574 <jiang123574@163.com>

* Update 'SimpleFin' to 'SimpleFIN' in translations

Signed-off-by: jiang123574 <jiang123574@163.com>

* update zh-CN.yml

* update zh-CN.yml

* add new zh-CN.yml

* CodeRabbit comments

* Enable Banking i18n

---------

Signed-off-by: jiang123574 <jiang123574@163.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>

app/helpers/languages_helper.rb

@@ -57,7 +57,7 @@ module LanguagesHelper
     tr: "Turkish",
     uk: "Ukrainian",
     vi: "Vietnamese",
-    'zh-CN': "Chinese (Simplified)",
+    'zh-CN': "简体中文",
     'zh-TW': "Chinese (Traditional)",
     af: "Afrikaans",
     az: "Azerbaijani",
@@ -162,7 +162,8 @@ module LanguagesHelper
     "nb",   # Norwegian Bokmål - 57 translation files
     "ca",   # Catalan - 57 translation files
     "ro",   # Romanian - 62 translation files
-    "pt-BR" # Brazilian Portuguese - 60 translation files
+    "pt-BR", # Brazilian Portuguese - 60 translation files
+    "zh-CN"  # Chinese (Simplified) - 59 translation files
   ].freeze
 
   COUNTRY_MAPPING = {