diff --git a/dev/translation/sanity_check_en_langfiles.php b/dev/translation/sanity_check_en_langfiles.php
new file mode 100644
index 00000000000..b39108ab746
--- /dev/null
+++ b/dev/translation/sanity_check_en_langfiles.php
@@ -0,0 +1,60 @@
+<?php
+/* Copyright (c) 2015 Lorenzo Novaro <novalore@19.coop>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// directory containing the english lang files
+$workdir = "../../htdocs/langs/en_US/";
+
+$files = scandir($workdir);
+$exludefiles = array('.','..','README');
+$files = array_diff($files,$exludefiles);
+$langstrings_3d = array();
+$langstrings_full = array();
+foreach ($files AS $file) {
+	$path_file = pathinfo($file);
+	// we're only interested in .lang files
+	if ($path_file['extension']=='lang') {
+		$content = file($workdir.$file);
+		foreach ($content AS $line => $row) {
+			// don't want comment lines
+			if (substr($row,0,1) !== '#') {
+				// don't want lines without the separator (why should those even be here, anyway...)
+				if (strpos($row,'=')!==false) {
+					$row_array = explode('=',$row);
+					$langstrings_3d[$path_file['basename']][$line+1]=$row_array[0];
+					$langstrings_full[]=$row_array[0];
+				}				
+			}
+		}
+	}
+}
+
+foreach ($langstrings_3d AS $filename => $file) {
+	foreach ($file AS $linenum => $value) {
+		$keys = array_keys($langstrings_full, $value);
+		if (count($keys)>1) {
+				foreach ($keys AS $key) {
+					$dups[$value][$filename] = $linenum;
+				}
+		}
+	}
+}
+
+echo "<h2>Duplicate strings in lang files in $workdir</h2>";
+echo "<pre>";
+print_r($dups);
+
+?>
\ No newline at end of file