Localize "search", "button", and "togglebutton" accessibility roles by using the platform roles

Summary:
Several accessibilityRole strings are hardcoded to only English on Android. Swap them to just use the platform constants. This way, TalkBack will handle translations.

This change swaps roles "search", "button", and "togglebutton" roles to use the platform description.

Changelog:
[Android][Changed] Localize "search", "button", and "togglebutton" accessibility roles by using the platform roles

Reviewed By: lunaleaps

Differential Revision: D28077246

fbshipit-source-id: 5b88a6fd7e78b3426506f253b823ecca0608c4bc

Author: kacieb

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactAccessibilityDelegate.java

@@ -385,18 +385,14 @@ public static void setRole(
         spannable.setSpan(new URLSpan(""), 0, spannable.length(), 0);
         nodeInfo.setText(spannable);
       }
-    } else if (role.equals(AccessibilityRole.SEARCH)) {
-      nodeInfo.setRoleDescription(context.getString(R.string.search_description));
     } else if (role.equals(AccessibilityRole.IMAGE)) {
       nodeInfo.setRoleDescription(context.getString(R.string.image_description));
     } else if (role.equals(AccessibilityRole.IMAGEBUTTON)) {
       nodeInfo.setRoleDescription(context.getString(R.string.imagebutton_description));
       nodeInfo.setClickable(true);
     } else if (role.equals(AccessibilityRole.BUTTON)) {
-      nodeInfo.setRoleDescription(context.getString(R.string.button_description));
       nodeInfo.setClickable(true);
     } else if (role.equals(AccessibilityRole.TOGGLEBUTTON)) {
-      nodeInfo.setRoleDescription(context.getString(R.string.toggle_button_description));
       nodeInfo.setClickable(true);
       nodeInfo.setCheckable(true);
     } else if (role.equals(AccessibilityRole.SUMMARY)) {

ReactAndroid/src/main/res/views/uimanager/values/strings_unlocalized.xml

@@ -4,22 +4,10 @@
     name="link_description"
     translatable="false"
     >Link</string>
-  <string
-    name="search_description"
-    translatable="false"
-    >Search Field</string>
   <string
     name="image_description"
     translatable="false"
     >Image</string>
-  <string
-    name="button_description"
-    translatable="false"
-    >Button</string>
-  <string
-    name="toggle_button_description"
-    translatable="false"
-    >Toggle Button</string>
   <string
     name="imagebutton_description"
     translatable="false"