adapt frontend titles and headings (4) (issue #566)

altered frontend view event
i changed typo "haeding" to "heading"
Merge pull request #5 from jojo12/patch-1

i changed typo "haeding" to "heading"
Merge branch 'develop' into feature/page-heading

Conflicts:
	site/views/event/view.html.php
adapt frontend titles and headings (5) (issue #566)

- altered frontend views event (again), editevent, editvenue
- added pageclass_sfx support in all frontend views
add css class jlcalendar back for js (issue #566)
Merge branch 'develop' into feature/page-heading

Conflicts:
	site/views/attendees/tmpl/default.php
	site/views/categories/view.html.php
	site/views/category/view.html.php
	site/views/day/tmpl/default.php
	site/views/editevent/tmpl/choosevenue.php
	site/views/editevent/tmpl/edit.php
	site/views/editevent/view.html.php
	site/views/editvenue/tmpl/edit.php
	site/views/editvenue/view.html.php
	site/views/event/view.html.php
	site/views/eventslist/view.html.php
	site/views/myattendances/tmpl/default.php
	site/views/myvenues/tmpl/default.php
	site/views/search/tmpl/default.php
	site/views/weekcal/tmpl/default.php
	site/views/weekcal/view.html.php
Merge pull request #615 from Hoffi1/feature/page-heading

last frontend views regarding issue #566
Amended Help Files
Merge pull request #618 from ernst67/master

Amended Help Files
deleted cleanup.html file

(was already changed to housekeeping .html
Merge pull request #619 from ernst67/master

deleted cleanup.html file
check also layout for menu item check (issue #616)
update: remove obsolete things from help (#620)