Change rich text setting to be more user-friendly.

Change-Id: I126d5ffffcf2e9d10940ebb672d42bb2a1529742
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764767Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689542}

chrome/browser/resources/chromeos/chromevox/chromevox/background/options.html

@@ -92,16 +92,16 @@
            class="checkbox pref" name="languageSwitching">
     <label for="languageSwitching" class="i18n"
            msgid="options_lang_switching_checkbox_label">
-      Automatically switch ChromeVox voice based on language.
+      Automatically switch ChromeVox voice based on language
     </label>
   </div>
 
   <div id="richTextIndicationOption">
-    <h2 class="i18n" msgid="options_rich_text_header">Rich Text Attributes</h2>
+    <h2 class="i18n" msgid="options_rich_text_header">Formatting</h2>
     <div class="option">
       <input id="announceRichTextAttributes" type="checkbox" class="checkbox pref" name="announceRichTextAttributes">
       <label for="announceRichTextAttributes" class="i18n" msgid="options_rich_text_checkbox_label">
-        Announce rich text attributes
+        Announce text styling
       </label>
     </div>
   </div>

chrome/browser/resources/chromeos/chromevox/strings/chromevox_strings.grd

@@ -3221,7 +3221,7 @@ If you're done with the tutorial, use ChromeVox to navigate to the Close button
       </message>
       <message desc="The text label for ChromeVox language switching checkbox."
         name="IDS_CHROMEVOX_OPTIONS_LANG_SWITCHING_CHECKBOX_LABEL">
-        Automatically switch ChromeVox voice based on language.
+        Automatically switch ChromeVox voice based on language
       </message>
       <message desc="Spoken to describe all rich text attributes of a node." name="IDS_CHROMEVOX_RICH_TEXT_ATTRIBUTES">
         Text formatting.
@@ -3656,10 +3656,10 @@ If you're done with the tutorial, use ChromeVox to navigate to the Close button
         Dodger Blue
       </message>
       <message desc="An options page section header for options about ChromeVox rich text behavior. This section lets users set preferences on how rich text attributes should be indicated." name="IDS_CHROMEVOX_OPTIONS_RICH_TEXT_HEADER">
-        Rich Text Attributes
+        Formatting
       </message>
       <message desc="The text label for ChromeVox automatic rich text indication checkbox." name="IDS_CHROMEVOX_OPTIONS_RICH_TEXT_CHECKBOX_LABEL">
-        Announce rich text attributes
+        Announce text styling
       </message>
       <message desc="Labels the misspell list box." name="IDS_CHROMEVOX_OPTIONS_MISSPELL_DESCRIPTION">
         Indicate misspell: