New l10n trick to create Poedit Translation Memory

Please review topic branch for a new trick for localizers:

For example for Spanish files, from the git repo:

find wiki/src/ -iname “*.es.po” > allspanish
msgcat —files-from=allspanish —output=allspanish.po

You can then configure it on your Poedit:

- Edit / Preferences / TM

- Learn from files
- Select your newly created file (allspanish.po in this case)

Feature Branch: emmapeel:doc/transmemory

Original created by @emmapeel on 12433 (Redmine)