json list fixes

http://www.camptocamp.org/forums/viewtopic.php?id=230596
- conditions and hastrack boolean correctly done
- empty total items & co

fixes #862
i18n
fixes and i18n for forum images wizard (cherry-picked from master)
Merge branch 'forum-images-wizard' into prod

somehow cherry picked from master
Update url to weather and avalanche bulletins (FR and CH)
Merge branch 'master' into prod

Conflicts:
	apps/frontend/i18n/messages.ca.po
	web/forums/mod_easy_bbcode.php
Banner Montania Seatosummit
Banner Diamir Vipec
Replaced banner rayon_rando by portail_glace
Merge branch 'master' into prod
Merge branch 'master' into prod
correct slug when pushing outings to metamoteur

fixes #798
books without specified language research

fixes #839
remove debug var_dump
update of Camp banners
Banner montania north face
Merge branch 'prod'
Merge branch 'master'