Added a dev script to help identify duplicate translation keys in language files

dev/detectduplicatelangkey.sh

+#!/bin/sh
+# Helps find duplicate translation keys in language files
+#
+# Copyright (C) 2014 Raphaël Doursenaud - rdoursenaud@gpcsolutions.fr
+
+for file in `find . -type f`
+do
+    dupes=$(
+    sed "s/^\s*//" "$file" | # Remove any leading whitespace
+    sed "s/\s*\=/=/" | # Remove any whitespace before =
+    grep -Po "(^.*?)=" | # Non greedeely match everything before =
+    sed "s/\=//" | # Remove trailing = so we get the key
+    sort | uniq -d # Find duplicates
+    )
+
+    if [ -n "$dupes" ]
+    then
+        echo "Duplicates found in $file"
+        echo "$dupes"
+    fi
+done