add back public API function, but mark as deprecated

lib/public/template.php

@@ -76,6 +76,16 @@ function relative_modified_date($timestamp) {
 }
 
 
+/**
+ * @brief DEPRECATED Return a human readable outout for a file size.
+ * @param $byte size of a file in byte
+ * @returns human readable interpretation of a file size
+ */
+function simple_file_size($bytes) {
+	return(\human_file_size($bytes));
+}
+
+
 /**
  * @brief Generate html code for an options block.
  * @param $options the options