Update strings for the copy error dialog to match the latest specs.

Change-Id: I9adeff3e7e9435237b4b3337e4c687eec39b0335
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 062d433..5281087 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -121,22 +121,20 @@
     <string name="copy_remaining"><xliff:g id="duration" example="3 minutes">%s</xliff:g> left</string>
     <!-- Toast shown when a file copy is kicked off -->
     <plurals name="copy_begin">
-      <item quantity="one">Copying <xliff:g id="count" example="1">%1$d</xliff:g> file.</item>
-      <item quantity="other">Copying <xliff:g id="count" example="3">%1$d</xliff:g> files.</item>
+        <item quantity="one">Copying <xliff:g id="count" example="1">%1$d</xliff:g> file.</item>
+        <item quantity="other">Copying <xliff:g id="count" example="3">%1$d</xliff:g> files.</item>
     </plurals>
     <!-- Text shown on the copy notification while DocumentsUI performs setup in preparation for copying files [CHAR LIMIT=32] -->
     <string name="copy_preparing">Preparing for copy\u2026</string>
     <!-- Title of the copy error notification [CHAR LIMIT=48] -->
     <plurals name="copy_error_notification_title">
-      <item quantity="one">Error copying <xliff:g id="count" example="1">%1$d</xliff:g> file.</item>
-      <item quantity="other">Error copying <xliff:g id="count" example="1">%1$d</xliff:g> files.</item>
+        <item quantity="one">Couldn\'t copy <xliff:g id="count" example="1">%1$d</xliff:g> file</item>
+        <item quantity="other">Couldn\'t copy <xliff:g id="count" example="2">%1$d</xliff:g> files</item>
     </plurals>
     <!-- Second line for notifications saying that more information will be shown after touching [CHAR LIMIT=48] -->
     <string name="notification_touch_for_details">Touch to view details</string>
     <!-- Label of a dialog button for retrying a failed operation [CHAR LIMIT=24] -->
     <string name="retry">Retry</string>
-    <!-- Title of the copying failure alert dialog. [CHAR LIMIT=48] -->
-    <string name="copy_failure_alert_title">Error copying files</string>
     <!-- Contents of the copying failure alert dialog. [CHAR LIMIT=48] -->
-    <string name="copy_failure_alert_content">Following files are not copied: <xliff:g id="list">%1$s</xliff:g></string>
+    <string name="copy_failure_alert_content">These files weren\'t copied: <xliff:g id="list">%1$s</xliff:g></string>
 </resources>