[Signin iOS] Update title in merging data dialog

ios/chrome/app/strings/ios_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definition of resources that will be translated for each
 locale.  The strings in this file are specific to iOS.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
@@ skipping 867 matching lines @@
       </message>
       <message name="IDS_IOS_OPTIONS_IMPORT_DATA_KEEP_SUBTITLE_SIGNIN" desc="The subtitle of the Keep Data Separate option on the Import Data settings screen when signing in. [400em]">
         Delete existing data.
       </message>
       <message name="IDS_IOS_OPTIONS_IMPORT_DATA_KEEP_SUBTITLE_SWITCH" desc="The subtitle of the Keep Data separate option on the Import Data settings screen when switching accounts. [400em]">
         Delete existing data. You can retrieve it by switching back to <ph name="USER_EMAIL1">$1<ex>john@doe.com</ex></ph>.
       </message>
       <message name="IDS_IOS_OPTIONS_IMPORT_DATA_KEEP_TITLE" desc="The title of the Keep Data Separate option on the Import Data settings screen. [60em]">
         Keep my data separate
       </message>
+      <message name="IDS_IOS_OPTIONS_IMPORT_DATA_TITLE_SWITCH" desc="The title of the Import Data settings screen when switching accounts. [30em]">
+        Switch Sync Account
+      </message>
       <message name="IDS_IOS_OPTIONS_PRELOAD_WEBPAGES" desc="Title for opening the setting for if/when to preload webpages. [Length: 20em] [iOS only]">
         Preload Webpages
       </message>
       <message name="IDS_IOS_OPTIONS_REPORT_AN_ISSUE" desc="Title for the option on Settings page to report an issue. [Length: 20em] [iOS only]">
         Report an Issue
       </message>
       <message name="IDS_IOS_OPTIONS_SEARCH_URL_SUGGESTIONS" desc="Title for the option to turn on/off search and URL suggestions. [Length: 18em] [iOS only]">
         Show Suggestions
       </message>
       <message name="IDS_IOS_OPTIONS_SEND_USAGE_DATA" desc="Title for opening the setting for if/when to send usage data and crash reports. [Length: 20em] [iOS only]">
@@ skipping 641 matching lines @@
       </message>
       <message name="IDS_IOS_VOICE_SEARCH_SETTING_TITLE" desc="The title for Voice Search setting [Length: 29em] [iOS only]">
         Voice Search
       </message>
       <message name="IDS_IOS_VOICE_SEARCH_SETTING_TTS" desc="The label for setting switch enabling text-to-speech response after voice search [Length: 29em] [iOS only]">
         Speak Answers Back
       </message>
     </messages>
   </release>
 </grit>