[MD-Settings A11y] Set alt text for expandable buttons.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_DETAILED_BUILD_INFO" desc="Label describing the section that shows detailed information about the current Chrome build.">
       Detailed build information
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_ARC_VERSION" desc="Label for ARC version">
       ARC Version
@@ skipping 390 matching lines @@
     </message>
     <message name="IDS_SETTINGS_BLUETOOTH_ADD_DEVICE" desc="Name of the settings page for adding bluetooth devices.">
       Add a Device
     </message>
     <message name="IDS_SETTINGS_BLUETOOTH_PAIR_DEVICE" desc="Name of the settings page for pairing bluetooth devices.">
       Pair Bluetooth Device
     </message>
     <message name="IDS_SETTINGS_BLUETOOTH_ENABLE" desc="Label for control to enable or disable bluetooth.">
       Enable Bluetooth
     </message>
+    <message name="IDS_SETTINGS_BLUETOOTH_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing available bluetooth devices. Only visible by screen reader software.">
+      Show available bluetooth devices
+    </message>
     <message name="IDS_SETTINGS_BLUETOOTH_REMOVE" desc="Label for removing (unpairing) a paired bluetooth device">
       Remove from list
     </message>
     <message name="IDS_SETTINGS_BLUETOOTH_REQUEST_PINCODE" desc="Bluetooth pairing message typically displayed when the external Bluetooth 2.0 and older device has no display or means of input.">
       Please enter the PIN for "<ph name="DEVICE_NAME">$1<ex>Nexus S</ex></ph>":
     </message>
     <message name="IDS_SETTINGS_BLUETOOTH_DISPLAY_PINCODE" desc="Bluetooth pairing message typically displayed when pairing a Bluetooth 2.0 and older wireless keyboard.">
       Please enter this PIN code on "<ph name="DEVICE_NAME">$1<ex>Nexus S</ex></ph>":
     </message>
     <message name="IDS_SETTINGS_BLUETOOTH_REQUEST_PASSKEY" desc="Bluetooth pairing message typically displayed when the external Bluetooth 2.1 and later device has no display or means of input, and does not support SSP.">
@@ skipping 65 matching lines @@
   </if>
 
   <if expr="use_nss_certs">
     <!-- Certificate Manager Page -->
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER" desc="Name of the certificate manager page which allows users to modify SSL certificate settings.">
       Certificate manager
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_YOUR_CERTIFICATES" desc="Label for the your certificates tab in certificate manager.">
       Your certificates
     </message>
+    <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the certificates that are installed for a particular organization. Only visible by screen reader software.">
+      Show certificates for organization
+    </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_YOUR_CERTIFICATES_DESCRIPTION" desc="Label for your certificates subtitle tab in certificate manager.">
       You have certificates from these organizations that identify you
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_SERVERS" desc="Label for the servers tab in certificate manager.">
       Servers
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_SERVERS_DESCRIPTION" desc="Label for servers subtitle tab in certificate manager.">
       You have certificates on file that identify these servers
     </message>
     <message name="IDS_SETTINGS_CERTIFICATE_MANAGER_NO_CERTIFICATES" desc="Message displayed by the certificate manager, indicating that there are no certificates for a given certificate category.">
@@ skipping 252 matching lines @@
     </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_ADD_PRINTER_TITLE" desc="Text for the title of the Add Printer dialog.">
       Add Printer
     </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_DETAILS_TITLE" desc="Text for the title of the Printer Details subpage.">
       Printer details
     </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_ADVANCED" desc="Label for the toggle control to show/hide the advanced details of the printer.">
       Advanced
     </message>
+    <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_ADVANCED_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the advanced printer options for a particular printer. Only visible by screen reader software.">
+      Show advanced printer options
+    </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_ADVANCED_ADDRESS" desc="Label for the CUPS printer address in the Advanced section in the printer details page.">
       Address
     </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_ADVANCED_PROTOCOL" desc="Label for the CUPS printer protocol in the Advanced section in the printer details page.">
       Protocol
     </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_DETAILS_NAME" desc="Lable for the CUPS printer name in the printer details page.">
       Name
     </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_DETAILS_MODEL" desc="Label for the CUPS printer model in the printer details page.">
@@ skipping 145 matching lines @@
     </message>
     <message name="IDS_SETTINGS_INTERNET_DETAIL" desc="Name of the settings page which displays network details.">
       Network Details
     </message>
     <message name="IDS_SETTINGS_INTERNET_KNOWN_NETWORKS" desc="Name of the settings page which displays the list of known networks.">
       Known Networks
     </message>
     <message name="IDS_SETTINGS_INTERNET_ADD_CONNECTION" desc="Settings > Internet > Add connection expanding section label.">
       Add connection
     </message>
+    <message name="IDS_SETTINGS_INTERNET_ADD_CONNECTION_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the options for a new connection. Only visible by screen reader software.">
+      Add network connection
+    </message>
     <message name="IDS_SETTINGS_INTERNET_ADD_WIFI" desc="Settings > Internet > Add Wi-Fi label.">
       Add Wi-Fi...
     </message>
     <message name="IDS_SETTINGS_INTERNET_ADD_VPN" desc="Settings > Internet > Add VPN label.">
       Add OpenVPN / L2TP...
     </message>
     <message name="IDS_SETTINGS_INTERNET_ADD_THIRD_PARTY_VPN" desc="Settings > Internet > Add third party VPN label">
       Add <ph name="PROVIDER_NAME">$1<ex>VPN Demo</ex></ph>...
     </message>
     <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_ACCESS_POINT" desc="Settings > Internet > Network details: Access Point section label.">
       Access Point
     </message>
     <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_ADVANCED" desc="Settings > Internet > Network details: Advanced section label.">
       Advanced
     </message>
+    <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the advanced network options. Only visible by screen reader software.">
+      Show advanced network options
+    </message>
     <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_NAMESERVERS" desc="Settings > Internet > Network details: Nameservers section label.">
       Nameservers
     </message>
     <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_NETWORK" desc="Settings > Internet > Network details: Network section label.">
       Network
     </message>
     <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_PROXY" desc="Settings > Internet > Network details: Proxy section label.">
       Proxy
     </message>
     <message name="IDS_SETTINGS_INTERNET_NETWORK_SECTION_WPAD" desc="Settings > Internet > Network details: Web Proxy Auto Discovery (WPAD) section label.">
@@ skipping 151 matching lines @@
       Preferred networks will be preferred over other known networks if more than one is available.
     </message>
     <message name="IDS_SETTINGS_INTERNET_KNOWN_NETWORKS_ALL" desc="Title for list of all other (non preferred) networks.">
       All networks
     </message>
 
     <!-- Strings used in <cr-network-list>, used in Settings and OOBE -->
     <message name="IDS_NETWORK_LIST_DISABLED" desc="Settings > Internet, text in network summary when the network type is connected">
       Disabled
     </message>
+    <message name="IDS_NETWORK_LIST_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the list of available network connections. Only visible by screen reader software.">
+      Show available network connections
+    </message>
     <message name="IDS_NETWORK_LIST_NOT_CONNECTED" desc="Settings > Internet, text in network summary when there is no network for the type.">
       No network
     </message>
     <message name="IDS_NETWORK_LIST_CONNECTED" desc="Settings > Internet, text to show in a network list item that is connected.">
       connected
     </message>
     <message name="IDS_NETWORK_LIST_CONNECTING" desc="Settings > Internet, text in network summary when the primary network is connecting.">
       Connecting to <ph name="NAME">$1<ex>GoogleGuest</ex></ph>
     </message>
     <message name="IDS_NETWORK_LIST_THIRD_PARTY_VPN_NAME_TEMPLATE" desc="Template for constructing the name of a VPN network that is handled by a third-party VPN provider from the provider name and the network name.">
@@ skipping 172 matching lines @@
     </message>
   </if>
   <if expr="not chromeos">
     <message name="IDS_SETTINGS_LANGUAGES_PAGE_TITLE" desc="Name of the settings page which displays language preferences.">
       Languages
     </message>
   </if>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_TITLE" desc="Title for the currently used language in the header for the collapsible list of languages.">
     Language
   </message>
+  <message name="IDS_SETTINGS_LANGUAGES_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the language options. Only visible by screen reader software.">
+    Show language options
+  </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_ORDERING_INSTRUCTIONS" desc="Explanatory message about ordering the list of languages.">
     Order languages based on your preference.
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_MOVE_UP" desc="Label for the menu item that moves the language up in the list of languages.">
     Move up
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_MOVE_DOWN" desc="Label for the menu item that moves the language down in the list of languages.">
     Move down
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_REMOVE" desc="Label for the menu item to remove a language from the list of enabled languages.">
     Remove
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_LIST_LANGUAGE_DETAIL" desc="Label for the menu item which opens a sub-page that displays details for a language.">
     Language settings
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_LANGUAGES_ADD" desc="Button under the list of enabled languages which opens a dialog that lets the user enable additional languages.">
     Add languages
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_OFFER_TO_TRANSLATE_IN_THIS_LANGUAGE" desc="The label for a checkbox which indicates whether or not pages in this language should be translated by default.">
     Offer to translate pages in this language
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_CANNOT_TRANSLATE_IN_THIS_LANGUAGE" desc="The string displayed in the details for a language when the language cannot be translated from.">
     This language cannot be translated
   </message>
   <if expr="chromeos">
     <message name="IDS_SETTINGS_LANGUAGES_INPUT_METHODS_LIST_TITLE" desc="Title for the current input method in the header for the collapsible list of enabled input methods (keyboard layouts and input method editors).">
       Input method
     </message>
+    <message name="IDS_SETTINGS_LANGUAGES_INPUT_METHODS_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the input options. Only visible by screen reader software.">
+      Show input options
+    </message>
     <message name="IDS_SETTINGS_LANGUAGES_INPUT_METHODS_MANAGE" desc="Button under the list of input methods which opens a sub-page that lets the user enable or disable keyboard layouts and input method editors.">
       Manage input methods
     </message>
     <message name="IDS_SETTINGS_LANGUAGES_MANAGE_INPUT_METHODS_TITLE" desc="Name of the settings sub-page which allows enabling and disabling input methods.">
       Manage input methods
     </message>
   </if>
   <message name="IDS_SETTINGS_LANGUAGES_MANAGE_LANGUAGES_TITLE" desc="Name of the settings dialog which allows enabling additional languages.">
     Add languages
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_ALL_LANGUAGES" desc="Header for the list of all supported languages, which the user can use to enable languages, on the Manage Languages page.">
     All languages
   </message>
   <message name="IDS_SETTINGS_LANGUAGES_ENABLED_LANGUAGES" desc="Header for the list of enabled languages, which the user can use to disable languages, on the Manage Languages page.">
     Enabled languages
   </message>
   <if expr="not is_macosx">
     <message name="IDS_SETTINGS_LANGUAGES_SPELL_CHECK_LIST_TITLE" desc="Title for the section containing the dropdown used to select the language to use for spell checking. The dropdown contains the enabled languages which support spell checking.">
       Spell check
     </message>
+    <message name="IDS_SETTINGS_LANGUAGES_SPELL_CHECK_EXPAND_ACCESSIBILITY_LABEL" desc="Label for the button that toggles showing the spell check options. Only visible by screen reader software.">
+      Show spell check options
+    </message>
     <message name="IDS_SETTINGS_LANGUAGES_SPELL_CHECK_SUMMARY_TWO_LANGUAGES" desc="Subtitle for the spell check section when spell check is enabled for two languages, listing those languages.">
       <ph name="LANGUAGE_1">$1<ex>English (United States)</ex></ph>, <ph name="LANGUAGE_2">$2<ex>Italian</ex></ph>
     </message>
     <message name="IDS_SETTINGS_LANGUAGES_SPELL_CHECK_SUMMARY_THREE_LANGUAGES" desc="Subtitle for the spell check section when spell check is enabled for three languages, listing only the first two.">
       <ph name="LANGUAGE_1">$1<ex>English (United States)</ex></ph>, <ph name="LANGUAGE_2">$2<ex>Italian</ex></ph>, and 1 other
     </message>
     <message name="IDS_SETTINGS_LANGUAGES_SPELL_CHECK_SUMMARY_MULTIPLE_LANGUAGES" desc="Subtitle for the spell check section when spell check is enabled for more than three languages, listing only the first two.">
       <ph name="LANGUAGE_1">$1<ex>English (United States)</ex></ph>, <ph name="LANGUAGE_2">$2<ex>Italian</ex></ph>, and <ph name="NUM_ADDITIONAL_LANGUAGES">$3<ex>2</ex></ph> others
     </message>
     <message name="IDS_SETTINGS_LANGUAGES_SPELL_CHECK_MANAGE" desc="Button under the dropdown of spell check languages which opens a sub-page that lets the user add or remove words to the custom list of words whitelisted for spell checking.">
@@ skipping 942 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>