Added/changed some strings for the Files app

chrome/browser/resources/file_manager/js/mock_chrome.js

Index: chrome/browser/resources/file_manager/js/mock_chrome.js
diff --git a/chrome/browser/resources/file_manager/js/mock_chrome.js b/chrome/browser/resources/file_manager/js/mock_chrome.js
index b6d0d73db8571abc6b71273d4c70102c453d10a1..97eb1150262c182576eb4aa47c00728f952717fc 100644
--- a/chrome/browser/resources/file_manager/js/mock_chrome.js
+++ b/chrome/browser/resources/file_manager/js/mock_chrome.js
@@ -456,7 +456,7 @@ chrome.fileBrowserPrivate = {
       SIZE_TB: 'TB',
       SIZE_PB: 'PB',
       TYPE_COLUMN_LABEL: 'Type',
-      DATE_COLUMN_LABEL: 'Date',
+      DATE_COLUMN_LABEL: 'Date modified',
       PREVIEW_COLUMN_LABEL: 'Preview',
 
       ERROR_CREATING_FOLDER: 'Unable to create folder "$1". $2',
@@ -540,7 +540,7 @@ chrome.fileBrowserPrivate = {
       GDATA_SHOW_HOSTED_FILES_OPTION: 'Show Google Docs files',
       GDATA_WAITING_FOR_SPACE_INFO: 'Waiting for space info...',
       GDATA_FAILED_SPACE_INFO: 'Failed to retrieve space info',
-      GDATA_BUY_MORE_SPACE: 'Buy more...',
+      GDATA_BUY_MORE_SPACE: 'Buy more storage...',
       GDATA_SPACE_AVAILABLE: '$1 left',
 
       OFFLINE_COLUMN_LABEL: 'Available offline',
@@ -658,6 +658,7 @@ chrome.fileBrowserPrivate = {
       EXCEL_FILE_TYPE: 'Excel spreadsheet',
 
       SEARCH_TEXT_LABEL: 'Search',
+      SEARCHING: 'Searching...',
       SEARCH_NO_MATCHING_FILES: 'No files match <b>"$1"</b>',
 
       TIME_TODAY: 'Today, $1',