Fix strings, style, tabulation code,

Fix strings, style, tabulation code,
Improvement of attachments tab

For attachments into event and venue.
review mailer plugin

new version with review/change of Bluefox (thanks) and others small
modification.
Can delete event image & venue image

Include delete event image and venue image from FE.
Merge branch 'master' of https://github.com/mckillo/JEM-Project into mckillo-master

Conflicts:
	media/css/geostyle.css
	plugins/plg_jem_mailer/language/en-GB/en-GB.plg_jem_mailer.ini
	plugins/plg_jem_mailer/mailer.php
	plugins/plg_jem_mailer/mailer.xml
	site/classes/output.class.php
	site/helpers/helper.php
	site/views/editevent/tmpl/edit_attachments.php
	site/views/editevent/view.html.php
	site/views/editvenue/tmpl/edit_attachments.php
	site/views/editvenue/view.html.php
Update edit_attachments.php

fix typo
ensure deleted image becomes invisible immediately

...also if lightbox isn't activated.
Merge pull request #742 from jemproject/mckillo-master

from Mckillo master: fixes, improved attachment tab, mailer, image deletion frontend