New: Module agenda go on calendar view by default

htdocs/admin/agenda.php

htdocs/admin/events.php

htdocs/comm/action/pre.inc.php

htdocs/comm/action/rapport/pre.inc.php

htdocs/includes/menus/barre_left/eldy_backoffice.php

htdocs/includes/menus/barre_left/eldy_frontoffice.php

htdocs/includes/modules/modAgenda.class.php

htdocs/langs/en_US/admin.lang

htdocs/langs/en_US/agenda.lang

htdocs/langs/fr_FR/admin.lang

htdocs/langs/fr_FR/agenda.lang

htdocs/langs/fr_FR/commercial.lang