Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 12641)
+++ wp-admin/includes/media.php	(working copy)
@@ -1772,14 +1772,14 @@
 	</th>
 	<td class="field">
 		<select id="columns" name="columns">
-			<option value="2"><?php _e('2'); ?></option>
-			<option value="3" selected="selected"><?php _e('3'); ?></option>
-			<option value="4"><?php _e('4'); ?></option>
-			<option value="5"><?php _e('5'); ?></option>
-			<option value="6"><?php _e('6'); ?></option>
-			<option value="7"><?php _e('7'); ?></option>
-			<option value="8"><?php _e('8'); ?></option>
-			<option value="9"><?php _e('9'); ?></option>
+			<option value="2"><?php echo number_format_i18n( 2 ); ?></option>
+			<option value="3" selected="selected"><?php echo number_format_i18n( 3 ); ?></option>
+			<option value="4"><?php echo number_format_i18n( 4 ); ?></option>
+			<option value="5"><?php echo number_format_i18n( 5 ); ?></option>
+			<option value="6"><?php echo number_format_i18n( 6 ); ?></option>
+			<option value="7"><?php echo number_format_i18n( 7 ); ?></option>
+			<option value="8"><?php echo number_format_i18n( 8 ); ?></option>
+			<option value="9"><?php echo number_format_i18n( 9 ); ?></option>
 		</select>
 	</td>
 	</tr>