Action triggers: added missing triggers to 3.6 migration script

These are the same changes than commit 3afb3a874d9d1533947651de9db28c9207278908 but for the
migration script
3.6 migration script: fixed invalid comments
Action triggers/Langs: fixed a bad translation key
Added a dev script to recursively deduplicate file lines on a per file basis

This script is useful to deduplicate language files
Deduplicated lines of the reference language files

Used the new deduplicatefilelinesrecursively.sh script
Qual: generic shebang
Added a dev script to help identify duplicate translation keys in language files