Enables the user to select multiple languages for spellchecking (UI)

chrome/app/resources/locale_settings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/locale_settings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="locale_settings_am.pak" type="data_package" lang="am" />
     <output filename="locale_settings_ar.pak" type="data_package" lang="ar" />
     <if expr="use_third_party_translations">
       <output filename="locale_settings_ast.pak" type="data_package" lang="ast" />
@@ skipping 236 matching lines @@
       <!-- The default value for |WebPreference::uses_universal_detector|. -->
       <message name="IDS_USES_UNIVERSAL_DETECTOR" use_name_for_id="true">
         false
       </message>
 
       <!-- The file name of the spellchecking dictionary without the extension (case-sensitive). -->
       <message name="IDS_SPELLCHECK_DICTIONARY" use_name_for_id="true">
         en-US
       </message>
 
+      <!-- The file name of the spellchecking dictionaries without the extension (case-sensitive). -->
+      <message name="IDS_SPELLCHECK_DICTIONARIES" use_name_for_id="true">
+        en-US
+      </message>      
+
       <!-- The width of the Crucial Notification bubble in characters (See above). -->
       <message name="IDS_CRUCIAL_NOTIFICATION_BUBBLE_WIDTH_CHARS" use_name_for_id="true">
         55
       </message>
 
       <!-- The width of the Extension Wipeout bubble in characters (See above). -->
       <message name="IDS_EXTENSION_WIPEOUT_BUBBLE_WIDTH_CHARS" use_name_for_id="true">
         55
       </message>
 
@@ skipping 151 matching lines @@
             500
         </message>
 
         <message name="IDS_FACTORY_RESET_HELP_URL" translateable="false">
           http://support.google.com/chromeos/bin/answer.py?answer=183084&amp;hl=[GRITLANGCODE]
         </message>
       </if>
     </messages>
   </release>
 </grit>