RCTLocalizedString: Extract FBTs to bundle for CocoaPods (#37678)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/37678

## Stack

React Native on iOS adds strings to Voiceover interactions to supply more information to users . Internally, and out-of-the-box externally, these are today always announced in English instead of being localized.

This stack adds a limited new internal API, `RCTLocalizedString(string, description)` to allow auto-translated strings which are consumed by both Meta and OSS.

Reviewed By: cipolleschi

Differential Revision: D46414630

fbshipit-source-id: 1137182dbbd89d959b3d143ce534229968bdb8f7

packages/react-native/React-Core.podspec

@@ -69,7 +69,7 @@ Pod::Spec.new do |s|
   s.author                 = "Meta Platforms, Inc. and its affiliates"
   s.platforms              = { :ios => min_ios_version_supported }
   s.source                 = source
-  s.resource_bundle        = { "AccessibilityResources" => ["React/AccessibilityResources/*.lproj"]}
+  s.resource_bundle        = { "RCTI18nStrings" => ["React/I18n/strings/*.lproj"]}
   s.compiler_flags         = folly_compiler_flags + ' ' + boost_compiler_flags
   s.header_dir             = "React"
   s.framework              = "JavaScriptCore"

packages/react-native/React/AccessibilityResources/en.lproj/Localizable.strings

@@ -1,26 +0,0 @@
-/*
-  Localizable.strings
-  React
-*/
-"alert"="alert";
-"checkbox"="checkbox";
-"combobox"="combo box";
-"menu"="menu";
-"menubar"="menu bar";
-"menuitem"="menu item";
-"progressbar"="progress bar";
-"radio"="radio button";
-"radiogroup"="radio group";
-"scrollbar"="scroll bar";
-"spinbutton"="spin button";
-"switch"="switch";
-"tab"="tab";
-"tablist"="tab list";
-"timer"="timer";
-"toolbar"="tool bar";
-"checked"="checked";
-"unchecked"="not checked";
-"busy"="busy";
-"expanded"="expanded";
-"collapsed"="collapsed";
-"mixed"="mixed";