Update email.php

Added the reply-to and reply-to-name variables in the sendMail method so that to have a return address to reply to the email sent.
Update fields.xml
Update da-DK.plg_fabrik_form_email.ini
Update de-DE.plg_fabrik_form_email.ini
Update el-GR.plg_fabrik_form_email.ini
Update en-GB.plg_fabrik_form_email.ini
Update es-ES.plg_fabrik_form_email.ini
Update et-EE.plg_fabrik_form_email.ini
Update fr-FR.plg_fabrik_form_email.ini
Update it-IT.plg_fabrik_form_email.ini
Update nl-NL.plg_fabrik_form_email.ini
Update pt-BR.plg_fabrik_form_email.ini
Update ro-RO.plg_fabrik_form_email.ini
Update ru-RU.plg_fabrik_form_email.ini
Update zh-TW.plg_fabrik_form_email.ini
Update fr-FR.plg_fabrik_form_limit.ini
Merge pull request #896 from jfquestiaux/joomla3

Joomla3 - update in the email form plugin